四年级练习题乘法交换律与结合律
小学数学四年级练习题——加法、乘法交换律与结合律基础知识训练题
![小学数学四年级练习题——加法、乘法交换律与结合律基础知识训练题](https://img.taocdn.com/s3/m/b2b6103aba68a98271fe910ef12d2af90242a82a.png)
小学四年级数学——加法、乘法交换律与结合律一、概念填空。
1、两个数相乘,交换乘数的(),积不变,这叫做()。
用字母表示为()。
2、三个数相加,先把()相加,再与()相加;或者先把()相加,再与()相加,它们的和不变,这叫做()。
用字母表示为()。
3、三个数相乘,先把()相乘,再与()相乘;或者先把()相乘,再与()相乘,它们的积不变,这叫做()。
用字母表示为()。
4、两个数相加,交换加数的(),和不变,这叫做()。
用字母表示为()。
5、用字母a、b、c表示下面运算定律:(l)加法交换律();(2)加法结合律();(3)乘法交换律();(4)乘法结合律()。
6、①82+56+18=56+(82+18) 是根据加法( )律和( )律;②4×125×8 =4×(125×8),这里运用了乘法( )律;③(25×18)×4=18×(25×4)。
这里运用了乘法( )律和( )律。
④计算64×26后,可以交换两个乘数的位置进行验算,是运用了()律。
⑤25×(20×28)=(25×20)×28 这是运用了()律。
⑥用简便方法计算66+98+34,要先算(),这是根据()律。
二、选择题。
1、下面一个零也不读的数是( )。
A.50060B.56000C.506002、与480×40的积一样的算式是( )。
A.48×40B.480×400C.48×4003、用两个2和三个0可以组成( )个不同的五位数。
A.3B.4C.54、42+27+58+43=(42+58)+(27+43)运用了( )。
A.加法交换律B.加法结合律C.加法交换律和结合律5、49×25×4=49×(25×4)运用了( )。
A.乘法交换律B.乘法分配律C.乘法结合律6、下面算式中( )运用了乘法交换律和结合律。
乘法交换律与结合律及简便算法练习题
![乘法交换律与结合律及简便算法练习题](https://img.taocdn.com/s3/m/e6bbae2a4b35eefdc8d3337c.png)
乘法交换律与结合律及简便运算练习题一.填空:1.15×16=16×□乘法-------------侓2.25×7×4=□×□×7 乘法------侓3.(60×25)×□=60×(□×8)乘法---侓4.125×(8×□)=(125×□)×14 乘法—侓5.3×4×8×5=(3×4)×(□×□)乘法—侓二.填合适的数:1.36×15=15×()2.25×17×4=(□×□)×173.(11×25)×□=11×(□×4)4.30×6×7=30×(□×□)三.简便计算:1.25×36×42.17×125×83.25×5×4×64.4×49×255.15×226.50×(326×20)7.125×17×16四.应用题:1.学校有一幢5层教学楼,每层有12间教室,每间教室有6个窗户。
整幢楼共有窗户多少个?2.一个游泳池长50米,小明每次游6个来回。
他每次游多少米?3.实验小学新盖一幢4层教学楼,每层有5间教室,每间教室要配25套双人座椅,实验小学一共需要购进多少套课座椅?(你能用两种方法解决吗?)4.同学们乘车去参观学习。
每辆车坐50人,用7辆车送两次才把所有的同学送走,去参观学习的同学有多少人?5.用拖拉机运化肥,每辆一次运14袋,每袋重75千克,8辆拖拉机一次可以运化肥多少千克?6.同学们体操表演,一共有8个方阵,每个方阵有9行,每行有25人,一共有多少人?7.学校组织同学们去旅游,租了2辆汽车,每辆坐24名学生,租车费一共是960元,进山时,每人买门票15元,坐索道上山,每人交费25元。
(完整)四年级运算定律练习题
![(完整)四年级运算定律练习题](https://img.taocdn.com/s3/m/f20f86b431126edb6f1a108b.png)
运算定律练习题(1)乘法交换律:a×b=b×a 乘法结合律:(a×b)×c=a×(b×c)38×25×4 42×125×8 25×17×4 (25×125)×(8×4)49×4×538×125×8×3 (125×25)×4 5 ×289×2 (125×12)×8 125×(12×4)(2) 乘法交换律和结合律的变化练习125×64 125×88 44×25 125×24 25×28(3)加法交换律:a+b=b+a 加法结合律:(a+b)+c=a+(b+c)357+288+143 158+395+105 167+289+33 129+235+171+165 378+527+73 169+78+22 58+39+42+61 138+293+62+107(4)乘法分配律:(a+b)×c=a×c+b×c 正用练习(80+4)×25 (20+4)×25 (125+17)×8 25×(40+4)15×(20+3)(5)乘法分配律正用的变化练习:36×3 25×41 39×101 125×88 201×24 (6)乘法分配律反用的练习:34×72+34×28 35×37+65×37 85×82+85×1825×97+25×3 76×25+25×24(7)乘法分配律反用的变化练习:38×29+38 75×299+75 64×199+64 35×68+68+68×64☆思考题:(8)其他的一些简便运算。
《乘法交换律、结合律》同步练习及答案 - 副本
![《乘法交换律、结合律》同步练习及答案 - 副本](https://img.taocdn.com/s3/m/bf9b40ac524de518964b7d8a.png)
《乘法交换律、结合律》同步练习一、我会口算50×2= 18×5=35×2= 8×25=125×8= 14×5=5×24= 12×5=5×16= 15×6=二、我会选(1)1534-534-278等于()A.534B.634C.722(2)58+36+64=58+(36+64)应用了()。
A.加法交换律B.加法结合律C.加法交换律和加法结合律(3)50×25×4×2=(50×2)×(25×4)这里运用了()。
A.乘法交换律B.乘法结合律C.乘法交换律和乘法结合律三、我是小法官(1)26×57+43×26=26×(57+43)()(2)125×(8×4)=(125×8)×4 ()(3)64×12=64×10×2 ()(4)几个数相乘,改变它们原来的运算顺序,积不变。
()四、怎样算简便就怎样算。
468-73-68 47+348+53+52(13×125)×(3×8) 28×6×2525×32×125 125×64五、解决问题1、一个游泳池长50m,小强每次都游7个来回。
他每次游多少米?2、四年级有3个班,每班有42人,四年级全体学生一共收集报纸504千克。
平均每个学生收集了多少千克?3、爸爸、妈妈带着明明去春游,先做公共汽车行驶8分钟,平均每分钟行驶120米,然后又步行380米走到天鹅湖。
则从家到天鹅湖的路程是多少米?4、学校参加合唱队共有队员58人,其中有6人参加小合唱,其余的人站成4排。
平均每排站多少人?参考答案一、我会口算50×2=100 18×5=9035×2=70 8×25=200125×8=100 14×5=705×24=120 12×5=605×16=80 15×6=90二、我会选(1)1534-534-278等于(B)A.534B.634C.722(2)58+36+64=58+(36+64)应用了(B )。
4年级数学乘法交换律和结合律1000题
![4年级数学乘法交换律和结合律1000题](https://img.taocdn.com/s3/m/aa45c66c0812a21614791711cc7931b765ce7b22.png)
练习范围:乘法交换律和结合律题数:100 月日姓名: 分秒成绩:8 ×125 × 8 = 25 × 73 × 4 = 25 × 84 × 4 =86 × 25 × 4 = 88 × 25 × 4 = 17 × 25 × 4 =25 × 47 × 4 = 38 × 25 × 4 = 25 × 25 × 4 = 125 × 5 × 8 = 42 × 25 × 4 = 8000 ÷ 8 ÷ 125 = 3000 ÷ 25 ÷ 4 = 14 × 25 × 4 = 25 × 91 × 4 = 6700 ÷ 25 ÷ 4 = 96 × 25 × 4 = 25 × 87 × 4 = 125 × 2 × 8 = 125 ×15 × 8 = 16000 ÷ 8 ÷ 125 = 13000 ÷ 25 ÷ 4 = 25 × 6 × 4 = 13000 ÷ 8 ÷ 125 = 5 ×125 × 8 = 25 × 66 × 4 = 2000 ÷ 25 ÷ 4 = 12000 ÷125 ÷ 8 = 800 ÷ 25 ÷ 4 = 14 ×125 × 8 =7 ×125 × 8 = 25 × 26 × 4 = 62 × 25 × 4 = 1000 ÷ 8 ÷ 125 = 125 × 8 × 8 = 30 × 25 × 4 =25 × 22 × 4 = 125 ×18 × 8 = 10000 ÷ 8 ÷ 125 = 5600 ÷ 25 ÷ 4 = 52 × 25 × 4 = 76 × 25 × 4 = 10000 ÷ 4 ÷ 25 =18 × 25 × 4 =15000 ÷ 8 ÷ 125 =25 × 59 × 4 = 7800 ÷ 25 ÷ 4 = 6000 ÷ 125 ÷ 8 = 18 ×125 × 8 = 15 ×125 × 8 = 7000 ÷ 125 ÷ 8 = 125 ×16 × 8 = 1000 ÷125 ÷ 8 = 7000 ÷ 25 ÷ 4 = 20000 ÷ 4 ÷ 25 = 19000 ÷ 8 ÷ 125 = 25 × 40 × 4 =25 × 75 × 4 = 13 ×125 × 8 = 11000 ÷ 8 ÷ 125 = 34 × 25 × 4 = 10000 ÷125 ÷ 8 = 20000 ÷125 ÷ 8 = 17000 ÷125 ÷ 8 = 19 ×125 × 8 = 7000 ÷ 8 ÷ 125 = 25 ×12 × 4 = 10 ×125 × 8 = 12000 ÷ 4 ÷ 25 = 2000 ÷125 ÷ 8 = 20000 ÷ 25 ÷ 4 = 3 ×125 × 8 =28 × 25 × 4 = 10000 ÷ 25 ÷ 4 = 3000 ÷ 125 ÷ 8 = 85 × 25 × 4 = 25 × 60 × 4 = 6600 ÷ 25 ÷ 4 = 24 × 25 × 4 = 18000 ÷125 ÷ 8 = 26 × 25 × 4 =20 ×125 × 8 = 6 ×125 × 8 = 125 × 6 × 8 =74 × 25 × 4 = 25 × 48 × 4 = 20000 ÷ 8 ÷ 125 = 125 ×10 × 8 = 19000 ÷125 ÷ 8 = 25 × 98 × 4 = 125 ×17 × 8 = 5900 ÷ 25 ÷ 4 = 8000 ÷ 4 ÷ 25 = 125 ×13 × 8 = 4 ×125 × 8 = 125 × 3 × 8 =12 × 25 × 4 =16 ×125 × 8 =3000 ÷ 4 ÷ 25 = 5500 ÷ 25 ÷ 4 =练习范围:乘法交换律和结合律题数:100 月日姓名: 分秒成绩:25 × 33 × 4 = 13000 ÷125 ÷ 8 = 25 × 79 × 4 =18 × 25 × 4 = 20000 ÷125 ÷ 8 = 34 × 25 × 4 =94 × 25 × 4 = 13 × 25 × 4 = 20 × 25 × 4 =14 × 25 × 4 = 8000 ÷125 ÷ 8 = 125 × 6 × 8 =16 ×125 × 8 = 25 × 58 × 4 = 12000 ÷ 4 ÷ 25 = 12 ×125 × 8 = 8000 ÷ 8 ÷ 125 = 125 ×16 × 8 = 11000 ÷ 8 ÷ 125 = 1000 ÷ 8 ÷ 125 = 8200 ÷ 25 ÷ 4 = 5 × 25 × 4 = 10000 ÷ 25 ÷ 4 = 18000 ÷125 ÷ 8 = 13 ×125 × 8 = 125 × 2 × 8 = 3 × 25 × 4 =800 ÷ 25 ÷ 4 = 62 × 25 × 4 = 10000 ÷ 4 ÷ 25 = 5000 ÷ 4 ÷ 25 = 67 × 25 × 4 = 20 ×125 × 8 = 7000 ÷ 25 ÷ 4 = 2900 ÷ 25 ÷ 4 = 6000 ÷ 125 ÷ 8 = 4000 ÷125 ÷ 8 = 25 × 49 × 4 = 6300 ÷ 25 ÷ 4 = 24 × 25 × 4 = 125 ×18 × 8 = 2000 ÷ 8 ÷ 125 = 2 ×125 × 8 =96 × 25 × 4 =11000 ÷ 25 ÷ 4 =8 ×125 × 8 = 16000 ÷ 8 ÷ 125 = 17 × 25 × 4 = 13000 ÷ 8 ÷ 125 = 6700 ÷ 25 ÷ 4 = 4 ×125 × 8 = 11000 ÷ 4 ÷ 25 = 4000 ÷ 25 ÷ 4 = 125 ×19 × 8 = 3000 ÷ 125 ÷ 8 = 9600 ÷ 25 ÷ 4 = 3 ×125 × 8 = 3000 ÷ 25 ÷ 4 = 25 × 34 × 4 = 25 × 98 × 4 =52 × 25 × 4 = 25 × 59 × 4 = 4000 ÷ 8 ÷ 125 = 15000 ÷ 4 ÷ 25 = 25 × 43 × 4 = 1700 ÷ 25 ÷ 4 = 1000 ÷ 4 ÷ 25 = 25 × 60 × 4 = 18 ×125 × 8 = 56 × 25 × 4 = 7100 ÷ 25 ÷ 4 = 19000 ÷125 ÷ 8 = 2000 ÷ 4 ÷ 25 = 6000 ÷ 4 ÷ 25 = 1600 ÷ 25 ÷ 4 = 11 × 25 × 4 = 8400 ÷ 25 ÷ 4 = 25 × 73 × 4 = 7000 ÷ 125 ÷ 8 = 7000 ÷ 4 ÷ 25 = 6 × 25 × 4 = 9100 ÷ 25 ÷ 4 = 19000 ÷ 4 ÷ 25 = 17 ×125 × 8 = 9000 ÷ 125 ÷ 8 = 19 ×125 × 8 = 25 × 5 × 4 =25 ×12 × 4 = 20000 ÷ 4 ÷ 25 = 125 × 5 × 8 = 10000 ÷ 8 ÷ 125 = 54 × 25 × 4 = 25 × 91 × 4 = 14000 ÷ 4 ÷ 25 = 125 × 4 × 8 = 25 × 92 × 4 =25 × 26 × 4 = 4 × 25 × 4 = 16000 ÷125 ÷ 8 = 15 × 25 × 4 =练习范围:乘法交换律和结合律题数:100 月日姓名: 分秒成绩:10 ×125 × 8 = 28 × 25 × 4 = 6500 ÷ 25 ÷ 4 = 10000 ÷ 25 ÷ 4 = 17000 ÷ 4 ÷ 25 = 15 ×125 × 8 = 12000 ÷125 ÷ 8 = 125 ×16 × 8 = 125 × 20 × 8 = 14000 ÷ 25 ÷ 4 = 8200 ÷ 25 ÷ 4 = 16 ×125 × 8 = 200 ÷ 25 ÷ 4 = 125 ×14 × 8 = 25 × 48 × 4 =9 ×125 × 8 = 125 × 6 × 8 = 25 × 36 × 4 = 125 × 5 × 8 = 125 ×18 × 8 = 25 × 79 × 4 = 25 × 60 × 4 = 125 × 4 × 8 = 25 × 32 × 4 = 3000 ÷ 4 ÷ 25 = 25 × 61 × 4 = 125 × 7 × 8 = 74 × 25 × 4 = 125 ×19 × 8 = 8000 ÷ 8 ÷ 125 = 72 × 25 × 4 = 800 ÷ 25 ÷ 4 = 8 × 25 × 4 =19 ×125 × 8 = 25 × 59 × 4 = 125 × 9 × 8 = 3000 ÷ 25 ÷ 4 = 5 ×125 × 8 = 2 ×125 × 8 =6 ×125 × 8 = 25 × 92 × 4 = 4 ×125 × 8 = 1900 ÷ 25 ÷ 4 =6000 ÷ 125 ÷ 8 =13000 ÷ 4 ÷ 25 =125 ×10 × 8 = 2000 ÷ 4 ÷ 25 = 17 × 25 × 4 = 15000 ÷125 ÷ 8 = 15000 ÷ 4 ÷ 25 = 17 ×125 × 8 = 7000 ÷ 25 ÷ 4 = 10000 ÷ 8 ÷ 125 = 25 × 40 × 4 =20 ×125 × 8 = 8000 ÷ 4 ÷ 25 = 125 ×13 × 8 = 18 × 25 × 4 = 18 ×125 × 8 = 4000 ÷125 ÷ 8 = 4000 ÷ 25 ÷ 4 = 1000 ÷ 8 ÷ 125 = 7300 ÷ 25 ÷ 4 = 1000 ÷125 ÷ 8 = 12000 ÷ 8 ÷ 125 = 19000 ÷125 ÷ 8 = 77 × 25 × 4 = 67 × 25 × 4 = 7000 ÷ 8 ÷ 125 = 5000 ÷ 125 ÷ 8 = 25 × 39 × 4 = 6000 ÷ 8 ÷ 125 = 125 ×12 × 8 = 15000 ÷ 8 ÷ 125 = 25 × 58 × 4 = 16000 ÷ 8 ÷ 125 = 20000 ÷ 4 ÷ 25 = 25 × 43 × 4 = 7000 ÷ 125 ÷ 8 = 25 × 89 × 4 = 25 × 99 × 4 =12 × 25 × 4 = 25 × 26 × 4 = 5100 ÷ 25 ÷ 4 = 5900 ÷ 25 ÷ 4 = 25 × 52 × 4 = 19000 ÷ 8 ÷ 125 = 25 ×17 × 4 = 24 × 25 × 4 = 18000 ÷125 ÷ 8 = 25 ×16 × 4 = 2400 ÷ 25 ÷ 4 = 16000 ÷125 ÷ 8 = 6000 ÷ 4 ÷ 25 = 12 ×125 × 8 = 25 × 73 × 4 =25 × 66 × 4 = 3000 ÷ 125 ÷ 8 = 25 × 34 × 4 =3 ×125 × 8 =练习范围:乘法交换律和结合律题数:100 月日姓名: 分秒成绩:13000 ÷ 8 ÷ 125 = 25 × 79 × 4 = 25 × 23 × 4 = 125 × 5 × 8 = 8000 ÷ 4 ÷ 25 = 40 × 25 × 4 =17 × 25 × 4 = 5000 ÷ 125 ÷ 8 = 25 × 48 × 4 = 125 ×16 × 8 = 25 × 43 × 4 = 25 × 59 × 4 = 19000 ÷125 ÷ 8 = 6000 ÷ 4 ÷ 25 = 25 × 52 × 4 =87 × 25 × 4 = 125 ×19 × 8 = 25 ×19 × 4 = 2000 ÷ 25 ÷ 4 = 7000 ÷ 125 ÷ 8 = 17000 ÷ 8 ÷ 125 = 17000 ÷ 25 ÷ 4 = 51 × 25 × 4 = 9000 ÷ 125 ÷ 8 = 5600 ÷ 25 ÷ 4 = 12 × 25 × 4 = 8 ×125 × 8 =25 × 40 × 4 = 9300 ÷ 25 ÷ 4 = 8200 ÷ 25 ÷ 4 = 10000 ÷ 8 ÷ 125 = 38 × 25 × 4 = 3000 ÷ 25 ÷ 4 = 5 × 25 × 4 = 14 ×125 × 8 = 125 × 9 × 8 =25 × 26 × 4 = 19000 ÷ 4 ÷ 25 = 12 ×125 × 8 = 16000 ÷ 4 ÷ 25 = 5000 ÷ 25 ÷ 4 = 25 × 73 × 4 = 17000 ÷ 4 ÷ 25 =18000 ÷125 ÷ 8 =800 ÷ 25 ÷ 4 =125 × 4 × 8 = 2800 ÷ 25 ÷ 4 = 7000 ÷ 25 ÷ 4 = 19000 ÷ 8 ÷ 125 = 26 × 25 × 4 = 3000 ÷ 125 ÷ 8 = 25 × 27 × 4 = 84 × 25 × 4 = 12000 ÷ 125 ÷ 8 = 25 × 58 × 4 = 4500 ÷ 25 ÷ 4 = 3600 ÷ 25 ÷ 4 = 11000 ÷ 25 ÷ 4 = 20 ×125 × 8 = 77 × 25 × 4 =46 × 25 × 4 = 13000 ÷125 ÷ 8 = 18 × 25 × 4 = 10000 ÷ 4 ÷ 25 = 9500 ÷ 25 ÷ 4 = 24 × 25 × 4 = 125 ×12 × 8 = 15000 ÷ 8 ÷ 125 = 15 ×125 × 8 = 13 ×125 × 8 = 4000 ÷ 25 ÷ 4 = 74 × 25 × 4 =25 × 34 × 4 = 5900 ÷ 25 ÷ 4 = 125 × 20 × 8 = 17 ×125 × 8 = 11000 ÷ 8 ÷ 125 = 8 × 25 × 4 = 15000 ÷125 ÷ 8 = 8000 ÷125 ÷ 8 = 18 ×125 × 8 = 25 × 70 × 4 = 8600 ÷ 25 ÷ 4 = 4 ×125 × 8 = 10000 ÷ 25 ÷ 4 = 6400 ÷ 25 ÷ 4 = 25 × 45 × 4 =96 × 25 × 4 = 72 × 25 × 4 = 9 × 25 × 4 =42 × 25 × 4 = 19000 ÷ 25 ÷ 4 = 16000 ÷ 125 ÷ 8 = 25 × 5 × 4 = 7800 ÷ 25 ÷ 4 = 25 × 91 × 4 = 3000 ÷ 4 ÷ 25 =125 × 2 × 8 =71 × 25 × 4 = 7000 ÷ 4 ÷ 25 =练习范围:乘法交换律和结合律题数:100 月日姓名: 分秒成绩:3000 ÷ 125 ÷ 8 = 25 × 33 × 4 = 14000 ÷125 ÷ 8 = 7000 ÷ 4 ÷ 25 = 2000 ÷ 8 ÷ 125 = 6200 ÷ 25 ÷ 4 = 25 × 75 × 4 = 2600 ÷ 25 ÷ 4 = 25 × 44 × 4 = 125 ×18 × 8 = 25 × 48 × 4 = 12 × 25 × 4 = 2000 ÷125 ÷ 8 = 8800 ÷ 25 ÷ 4 = 13 ×125 × 8 = 85 × 25 × 4 = 7000 ÷ 125 ÷ 8 = 18000 ÷ 8 ÷ 125 = 87 × 25 × 4 = 62 × 25 × 4 = 19000 ÷125 ÷ 8 = 6700 ÷ 25 ÷ 4 = 25 × 58 × 4 = 3900 ÷ 25 ÷ 4 = 96 × 25 × 4 = 19 ×125 × 8 = 8000 ÷125 ÷ 8 = 12000 ÷125 ÷ 8 = 74 × 25 × 4 = 13000 ÷ 4 ÷ 25 = 19000 ÷ 4 ÷ 25 = 1000 ÷ 8 ÷ 125 = 4 ×125 × 8 =8 × 25 × 4 = 7500 ÷ 25 ÷ 4 = 7000 ÷ 8 ÷ 125 = 25 × 92 × 4 = 42 × 25 × 4 = 12 ×125 × 8 = 12000 ÷ 8 ÷ 125 = 6 ×125 × 8 = 125 × 8 × 8 = 125 × 20 × 8 =7 ×125 × 8 =25 × 32 × 4 =5000 ÷ 25 ÷ 4 = 58 × 25 × 4 = 4000 ÷125 ÷ 8 = 10 ×125 × 8 = 11000 ÷125 ÷ 8 = 25 ×12 × 4 = 6000 ÷ 125 ÷ 8 = 11000 ÷ 8 ÷ 125 = 25 ×13 × 4 = 7000 ÷ 25 ÷ 4 = 25 × 49 × 4 = 125 ×11 × 8 = 14 × 25 × 4 = 17000 ÷125 ÷ 8 = 25 × 35 × 4 = 8200 ÷ 25 ÷ 4 = 17000 ÷ 8 ÷ 125 = 20 ×125 × 8 = 11 ×125 × 8 = 6000 ÷ 4 ÷ 25 = 25 × 2 × 4 =125 × 7 × 8 = 125 × 4 × 8 = 10000 ÷ 8 ÷ 125 = 125 × 9 × 8 = 16 ×125 × 8 = 32 × 25 × 4 = 5000 ÷ 125 ÷ 8 = 25 × 28 × 4 = 8000 ÷ 8 ÷ 125 = 54 × 25 × 4 = 6100 ÷ 25 ÷ 4 = 125 ×12 × 8 = 77 × 25 × 4 = 29 × 25 × 4 = 25 × 66 × 4 =66 × 25 × 4 = 25 × 76 × 4 = 25 × 5 × 4 =15 ×125 × 8 = 78 × 25 × 4 = 10000 ÷ 25 ÷ 4 = 1000 ÷ 4 ÷ 25 = 52 × 25 × 4 = 25 × 60 × 4 =17 × 25 × 4 = 14000 ÷ 8 ÷ 125 = 18000 ÷ 125 ÷ 8 = 6400 ÷ 25 ÷ 4 = 11000 ÷ 4 ÷ 25 = 8000 ÷ 4 ÷ 25 = 1000 ÷125 ÷ 8 =2000 ÷ 4 ÷ 25 =3000 ÷ 4 ÷ 25 = 125 × 5 × 8 =练习范围:乘法交换律和结合律题数:100 月日姓名: 分秒成绩:1000 ÷125 ÷ 8 = 18000 ÷125 ÷ 8 = 24 × 25 × 4 =6 ×125 × 8 = 125 ×13 × 8 = 3 × 25 × 4 = 6000 ÷ 8 ÷ 125 = 18000 ÷ 8 ÷ 125 = 25 × 59 × 4 =80 × 25 × 4 = 18 × 25 × 4 = 4 ×125 × 8 = 12000 ÷125 ÷ 8 = 17 ×125 × 8 = 1000 ÷ 4 ÷ 25 = 67 × 25 × 4 = 64 × 25 × 4 = 25 × 34 × 4 =46 × 25 × 4 = 5600 ÷ 25 ÷ 4 = 5 × 25 × 4 =25 × 4 × 4 = 16000 ÷125 ÷ 8 = 125 × 9 × 8 =25 × 73 × 4 = 11000 ÷ 4 ÷ 25 = 65 × 25 × 4 =25 × 49 × 4 = 125 × 6 × 8 = 16000 ÷ 8 ÷ 125 = 7000 ÷ 4 ÷ 25 = 19 ×125 × 8 = 25 ×12 × 4 = 5000 ÷ 125 ÷ 8 = 8000 ÷125 ÷ 8 = 17000 ÷ 8 ÷ 125 = 3000 ÷ 125 ÷ 8 = 12 × 25 × 4 = 125 × 4 × 8 =88 × 25 × 4 = 92 × 25 × 4 = 10000 ÷ 25 ÷ 4 = 87 × 25 × 4 =2600 ÷ 25 ÷ 4 =125 × 2 × 8 =25 × 66 × 4 = 34 × 25 × 4 = 23 × 25 × 4 = 85 × 25 × 4 = 1000 ÷ 8 ÷ 125 = 28 × 25 × 4 = 5000 ÷ 8 ÷ 125 = 25 × 43 × 4 = 125 × 7 × 8 = 20000 ÷ 25 ÷ 4 = 13000 ÷ 8 ÷ 125 = 8000 ÷ 4 ÷ 25 = 16 ×125 × 8 = 3 ×125 × 8 = 1000 ÷ 25 ÷ 4 = 19000 ÷125 ÷ 8 = 54 × 25 × 4 = 125 ×15 × 8 = 25 × 40 × 4 = 18000 ÷ 4 ÷ 25 = 2500 ÷ 25 ÷ 4 = 9 ×125 × 8 = 7000 ÷ 8 ÷ 125 = 12 ×125 × 8 = 91 × 25 × 4 = 16000 ÷ 4 ÷ 25 = 125 ×19 × 8 = 12000 ÷ 4 ÷ 25 = 3900 ÷ 25 ÷ 4 = 3000 ÷ 25 ÷ 4 = 6400 ÷ 25 ÷ 4 = 62 × 25 × 4 = 8 ×125 × 8 = 25 × 92 × 4 = 20000 ÷ 4 ÷ 25 = 25 × 79 × 4 = 25 × 38 × 4 = 3000 ÷ 4 ÷ 25 = 7000 ÷ 25 ÷ 4 = 7000 ÷ 125 ÷ 8 = 25 × 91 × 4 = 4300 ÷ 25 ÷ 4 = 10000 ÷ 4 ÷ 25 = 99 × 25 × 4 = 9000 ÷ 125 ÷ 8 = 17 × 25 × 4 = 19000 ÷ 4 ÷ 25 = 25 × 27 × 4 = 6700 ÷ 25 ÷ 4 = 14000 ÷125 ÷ 8 = 125 ×11 × 8 = 25 × 48 × 4 = 25 × 58 × 4 = 14000 ÷ 4 ÷ 25 = 70 × 25 × 4 =练习范围:乘法交换律和结合律题数:100 月日姓名: 分秒成绩:125 ×18 × 8 = 24 × 25 × 4 = 25 × 72 × 4 = 18000 ÷125 ÷ 8 = 125 × 2 × 8 = 9 ×125 × 8 =27 × 25 × 4 = 5000 ÷ 125 ÷ 8 = 5400 ÷ 25 ÷ 4 = 6000 ÷ 125 ÷ 8 = 25 × 59 × 4 = 54 × 25 × 4 = 125 ×16 × 8 = 3400 ÷ 25 ÷ 4 = 16 ×125 × 8 = 25 × 79 × 4 = 125 ×19 × 8 = 42 × 25 × 4 = 125 × 8 × 8 = 8 × 25 × 4 = 25 × 40 × 4 = 6000 ÷ 4 ÷ 25 = 3000 ÷ 4 ÷ 25 = 3 × 25 × 4 = 13000 ÷ 8 ÷ 125 = 25 × 36 × 4 = 16000 ÷ 8 ÷ 125 = 12 ×125 × 8 = 4000 ÷125 ÷ 8 = 17000 ÷125 ÷ 8 = 12000 ÷ 4 ÷ 25 = 5 × 25 × 4 = 6400 ÷ 25 ÷ 4 = 3 ×125 × 8 = 73 × 25 × 4 = 800 ÷ 25 ÷ 4 = 41 × 25 × 4 = 5 ×125 × 8 = 48 × 25 × 4 = 3000 ÷ 125 ÷ 8 = 9000 ÷ 125 ÷ 8 = 25 × 43 × 4 = 15000 ÷ 8 ÷ 125 =68 × 25 × 4 =13 ×125 × 8 =10000 ÷125 ÷ 8 = 6000 ÷ 8 ÷ 125 = 47 × 25 × 4 =25 × 71 × 4 = 1000 ÷ 25 ÷ 4 = 25 × 48 × 4 =34 × 25 × 4 = 9500 ÷ 25 ÷ 4 = 19 ×125 × 8 = 17 × 25 × 4 = 10000 ÷ 25 ÷ 4 = 8000 ÷ 4 ÷ 25 = 125 ×15 × 8 = 10000 ÷ 4 ÷ 25 = 67 × 25 × 4 = 125 × 5 × 8 = 25 × 74 × 4 = 125 ×10 × 8 = 15000 ÷125 ÷ 8 = 125 ×13 × 8 = 11 ×125 × 8 = 25 × 34 × 4 = 16 × 25 × 4 = 25 × 60 × 4 = 125 × 7 × 8 = 19000 ÷125 ÷ 8 = 8300 ÷ 25 ÷ 4 = 8200 ÷ 25 ÷ 4 = 8 ×125 × 8 = 12 × 25 × 4 = 3000 ÷ 25 ÷ 4 = 17000 ÷ 8 ÷ 125 = 14000 ÷ 8 ÷ 125 = 125 ×17 × 8 = 6700 ÷ 25 ÷ 4 = 84 × 25 × 4 =25 × 80 × 4 = 10000 ÷ 8 ÷ 125 = 12000 ÷ 8 ÷ 125 = 25 × 75 × 4 = 62 × 25 × 4 = 9000 ÷ 8 ÷ 125 = 87 × 25 × 4 = 125 × 6 × 8 = 77 × 25 × 4 =25 × 26 × 4 = 25 ×13 × 4 = 6 ×125 × 8 =25 × 92 × 4 = 46 × 25 × 4 = 7900 ÷ 25 ÷ 4 = 85 × 25 × 4 = 125 × 9 × 8 = 1000 ÷ 8 ÷ 125 = 25 × 98 × 4 =练习范围:乘法交换律和结合律题数:100 月日姓名: 分秒成绩:5 ×125 × 8 = 7000 ÷ 25 ÷ 4 = 9000 ÷ 25 ÷ 4 = 9000 ÷ 125 ÷ 8 = 2000 ÷ 8 ÷ 125 = 74 × 25 × 4 = 6400 ÷ 25 ÷ 4 = 20000 ÷125 ÷ 8 = 25 × 66 × 4 = 13 ×125 × 8 = 51 × 25 × 4 = 19000 ÷ 4 ÷ 25 = 12 ×125 × 8 = 25 × 74 × 4 = 6000 ÷ 4 ÷ 25 = 5000 ÷ 8 ÷ 125 = 5600 ÷ 25 ÷ 4 = 62 × 25 × 4 = 25 × 26 × 4 = 125 × 3 × 8 = 25 × 60 × 4 = 25 × 73 × 4 = 46 × 25 × 4 = 25 × 40 × 4 = 25 × 37 × 4 = 5000 ÷ 125 ÷8 = 25 × 35 × 4 = 4000 ÷ 8 ÷ 125 = 6000 ÷ 125 ÷ 8 = 17 ×125 × 8 = 16000 ÷125 ÷ 8 = 10000 ÷ 8 ÷ 125 = 34 × 25 × 4 = 5800 ÷ 25 ÷ 4 = 15 ×125 × 8 = 25 × 34 × 4 = 24 × 25 × 4 = 6700 ÷ 25 ÷ 4 = 125 ×16 × 8 = 8 × 25 × 4 = 15000 ÷125 ÷ 8 = 25 × 98 × 4 = 77 × 25 × 4 =20 ×125 × 8 =4000 ÷125 ÷ 8 =18 ×125 × 8 = 3000 ÷ 4 ÷ 25 = 25 × 43 × 4 =25 × 91 × 4 = 3000 ÷ 125 ÷ 8 = 90 × 25 × 4 = 16000 ÷ 4 ÷ 25 = 7000 ÷ 8 ÷ 125 = 15000 ÷ 8 ÷ 125 = 18000 ÷125 ÷ 8 = 2000 ÷ 4 ÷ 25 = 4 ×125 × 8 =87 × 25 × 4 = 12000 ÷ 8 ÷ 125 = 800 ÷ 25 ÷ 4 = 10000 ÷125 ÷ 8 = 25 × 88 × 4 = 19 ×125 × 8 = 16 × 25 × 4 = 125 × 2 × 8 = 125 ×14 × 8 = 6100 ÷ 25 ÷ 4 = 96 × 25 × 4 = 7000 ÷ 125 ÷ 8 = 25 × 75 × 4 = 300 ÷ 25 ÷ 4 = 11000 ÷ 4 ÷ 25 = 7800 ÷ 25 ÷ 4 = 125 × 5 × 8 = 55 × 25 × 4 =25 × 92 × 4 = 25 × 6 × 4 = 7 ×125 × 8 =18 × 25 × 4 = 25 × 48 × 4 = 125 × 7 × 8 =11 ×125 × 8 = 1000 ÷ 4 ÷ 25 = 125 ×17 × 8 = 85 × 25 × 4 = 1000 ÷ 8 ÷ 125 = 3300 ÷ 25 ÷ 4 = 25 ×12 × 4 = 16000 ÷ 8 ÷ 125 = 25 × 50 × 4 = 125 × 6 × 8 = 125 ×10 × 8 = 6000 ÷ 25 ÷ 4 = 38 × 25 × 4 = 12000 ÷ 4 ÷ 25 = 2000 ÷125 ÷ 8 = 6 ×125 × 8 =25 × 2 × 4 =2300 ÷ 25 ÷ 4 = 19000 ÷ 8 ÷ 125 =练习范围:乘法交换律和结合律题数:100 月日姓名: 分秒成绩:6000 ÷ 125 ÷ 8 = 10 ×125 × 8 = 1000 ÷ 4 ÷ 25 = 96 × 25 × 4 = 18 ×125 × 8 = 27 × 25 × 4 = 16000 ÷ 8 ÷ 125 = 1100 ÷ 25 ÷ 4 = 7000 ÷ 125 ÷ 8 = 9000 ÷ 125 ÷ 8 = 25 × 46 × 4 = 25 × 40 × 4 = 6000 ÷ 4 ÷ 25 = 5600 ÷ 25 ÷ 4 = 20000 ÷ 25 ÷ 4 = 125 ×11 × 8 = 25 × 53 × 4 = 52 × 25 × 4 = 83 × 25 × 4 = 25 × 48 × 4 = 125 ×15 × 8 = 13 ×125 × 8 = 100 ÷ 25 ÷ 4 = 98 × 25 × 4 = 7000 ÷ 25 ÷ 4 = 18000 ÷125 ÷ 8 = 25 × 24 × 4 = 15000 ÷ 8 ÷ 125 = 24 × 25 × 4 = 1000 ÷125 ÷ 8 = 25 × 59 × 4 = 25 × 55 × 4 = 15 ×125 × 8 = 6400 ÷ 25 ÷ 4 = 8 × 25 × 4 = 54 × 25 × 4 = 25 × 67 × 4 = 16000 ÷ 4 ÷ 25 = 25 × 91 × 4 = 10000 ÷ 25 ÷ 4 = 25 × 34 × 4 = 2000 ÷125 ÷ 8 = 125 × 9 × 8 =1000 ÷ 8 ÷ 125 =125 ×10 × 8 =3000 ÷ 4 ÷ 25 = 34 × 25 × 4 = 3400 ÷ 25 ÷ 4 = 25 × 61 × 4 = 125 ×12 × 8 = 25 × 66 × 4 = 19000 ÷125 ÷ 8 = 3000 ÷ 125 ÷ 8 = 4000 ÷ 8 ÷ 125 = 9200 ÷ 25 ÷ 4 = 25 × 79 × 4 = 7000 ÷ 8 ÷ 125 = 5000 ÷ 8 ÷ 125 = 62 × 25 × 4 = 16 ×125 × 8 = 14 × 25 × 4 = 25 × 56 × 4 = 5000 ÷ 4 ÷ 25 = 19000 ÷ 4 ÷ 25 = 25 × 73 × 4 = 7800 ÷ 25 ÷ 4 = 25 × 20 × 4 = 25 × 76 × 4 = 6 ×125 × 8 = 7000 ÷ 4 ÷ 25 = 85 × 25 × 4 = 125 ×16 × 8 = 8 ×125 × 8 = 9000 ÷ 4 ÷ 25 = 25 × 75 × 4 =17 × 25 × 4 = 125 ×19 × 8 = 5 ×125 × 8 =18 × 25 × 4 = 11000 ÷125 ÷ 8 = 25 × 58 × 4 = 125 × 4 × 8 = 25 × 95 × 4 = 25 × 81 × 4 = 10000 ÷ 4 ÷ 25 = 12000 ÷ 4 ÷ 25 = 25 × 60 × 4 = 17 ×125 × 8 = 11000 ÷ 4 ÷ 25 = 87 × 25 × 4 = 18000 ÷ 4 ÷ 25 = 3000 ÷ 25 ÷ 4 = 125 × 5 × 8 = 25 × 52 × 4 = 8200 ÷ 25 ÷ 4 = 5 × 25 × 4 = 8000 ÷125 ÷ 8 =42 × 25 × 4 =600 ÷ 25 ÷ 4 = 14000 ÷ 4 ÷ 25 =练习范围:乘法交换律和结合律题数:100 月日姓名: 分秒成绩:19 ×125 × 8 = 19000 ÷125 ÷ 8 = 54 × 25 × 4 = 125 ×16 × 8 = 3000 ÷ 125 ÷ 8 = 25 × 82 × 4 = 125 ×10 × 8 = 66 × 25 × 4 = 34 × 25 × 4 = 3700 ÷ 25 ÷ 4 = 25 × 56 × 4 = 15 ×125 × 8 = 14 × 25 × 4 = 6000 ÷ 8 ÷ 125 = 125 ×19 × 8 = 25 × 40 × 4 = 13 ×125 × 8 = 3900 ÷ 25 ÷ 4 = 14000 ÷ 8 ÷ 125 = 8700 ÷ 25 ÷ 4 = 9000 ÷ 25 ÷ 4 = 16000 ÷ 8 ÷ 125 = 24 × 25 × 4 = 2000 ÷ 4 ÷ 25 = 1000 ÷125 ÷ 8 = 25 × 92 × 4 = 18000 ÷125 ÷ 8 = 6600 ÷ 25 ÷ 4 = 18000 ÷ 4 ÷ 25 = 7800 ÷ 25 ÷ 4 = 14000 ÷ 4 ÷ 25 = 87 × 25 × 4 = 5 × 25 × 4 = 15000 ÷ 8 ÷ 125 = 25 × 43 × 4 = 7700 ÷ 25 ÷ 4 = 800 ÷ 25 ÷ 4 = 5000 ÷ 125 ÷ 8 = 46 × 25 × 4 = 125 × 5 × 8 = 7000 ÷ 25 ÷ 4 = 13000 ÷ 8 ÷ 125 = 25 × 98 × 4 =67 × 25 × 4 =125 ×15 × 8 =6700 ÷ 25 ÷ 4 = 125 × 4 × 8 = 39 × 25 × 4 =16 ×125 × 8 = 125 × 3 × 8 = 6000 ÷ 125 ÷ 8 = 1000 ÷ 4 ÷ 25 = 125 ×12 × 8 = 12 ×125 × 8 = 19000 ÷ 8 ÷ 125 = 19000 ÷ 4 ÷ 25 = 7000 ÷ 8 ÷ 125 = 25 × 66 × 4 = 19 × 25 × 4 = 12000 ÷125 ÷ 8 = 25 × 78 × 4 = 8400 ÷ 25 ÷ 4 = 5000 ÷ 8 ÷ 125 = 25 × 58 × 4 = 4400 ÷ 25 ÷ 4 = 17000 ÷ 4 ÷ 25 = 13000 ÷ 4 ÷ 25 = 25 × 73 × 4 = 7 ×125 × 8 = 9000 ÷ 125 ÷ 8 = 4100 ÷ 25 ÷ 4 = 10000 ÷ 25 ÷ 4 = 63 × 25 × 4 = 96 × 25 × 4 = 125 ×11 × 8 = 18 × 25 × 4 = 125 × 8 × 8 = 25 × 34 × 4 = 13000 ÷125 ÷ 8 = 8000 ÷125 ÷ 8 = 83 × 25 × 4 =29 × 25 × 4 = 4300 ÷ 25 ÷ 4 = 6000 ÷ 4 ÷ 25 = 8 ×125 × 8 = 25 × 75 × 4 = 25 × 59 × 4 =17 × 25 × 4 = 20000 ÷ 8 ÷ 125 = 6400 ÷ 25 ÷ 4 = 74 × 25 × 4 = 25 × 49 × 4 = 25 × 48 × 4 =3 ×125 × 8 = 25 × 93 ×4 = 7000 ÷ 4 ÷ 25 = 125 ×13 × 8 = 5 ×125 × 8 = 200 ÷ 25 ÷ 4 = 125 × 2 × 8 =。
乘法交换律和结合律练习题
![乘法交换律和结合律练习题](https://img.taocdn.com/s3/m/06b262dbf705cc1755270982.png)
乘法交换律和结合律练习题一、用简便方法计算下面各题23×15×2125×7×250×56×475×9×2二、在□里填上适当的数35×8=35×45×12=45× 16×15=16× 18×25=18× 125×32=125×25×24=25×三、用简便方法计算:45×828×125×1125×3275×24四、判断18×12×5=18×,这应用了乘法结合律。
5×=×9,这是应用了乘法交换律。
五、应用乘法交换律和结合律,在□里填上适当的数。
125×7×8=×45×25×□=45×5×=×xa×b×c=a×5×16= 45×=×□六、用简便方法计算下面各题69×25×424×125×25×326×1569×10×125×87+184+461+43+39+157479+20279-×4125×72七、一筐橘子重47千克,每千克橘子能卖4元钱,5筐这样的橘子能卖多少钱?八、一盒铅笔25元,买了16盒,应付多少元?九、建筑队运沙,一辆车每次可运8吨,14辆车25次可以运沙多少吨?十、张师傅一天加工了135个零件,李师傅两天加工的零件是他的3倍还要多53个。
李师傅两天一共加工了多少个零件?乘法交换律与结合律练习题作者:孙道所一、仔细想,认真填1、两个数相加,交换加数的,和不变,这叫做。
交换律、结合律和分配律的四年级计算题
![交换律、结合律和分配律的四年级计算题](https://img.taocdn.com/s3/m/d5e65a94185f312b3169a45177232f60dccce76c.png)
交换律、结合律和分配律的四年级计算题介绍交换律、结合律和分配律是数学运算中常用的基本法则。
在四年级的研究中,学生需要掌握并运用这些法则来解决各种计算题。
交换律定义交换律是指在某些数学运算中,改变运算对象的顺序不会改变结果。
具体来说,对于加法和乘法运算,交换律的定义如下:- 加法交换律:a + b = b + a- 乘法交换律:a × b = b × a例子以下是一些具体的交换律的计算题例子:1. 3 + 2 = 2 + 32. 4 × 5 = 5 × 4结合律定义结合律是指在某些数学运算中,改变运算对象的分组方式不会改变结果。
具体来说,对于加法和乘法运算,结合律的定义如下:- 加法结合律:(a + b) + c = a + (b + c)- 乘法结合律:(a × b) × c = a × (b × c)例子以下是一些具体的结合律的计算题例子:1. (2 + 3) + 4 = 2 + (3 + 4)2. (4 × 5) × 2 = 4 × (5 × 2)分配律定义分配律是指在某些数学运算中,一个数与一组数的运算结果再与另一个数进行运算,与先将这个数与每个数分别运算后再进行运算得到的结果相同。
具体来说,对于加法和乘法运算,分配律的定义如下:- 加法分配律:a × (b + c) = (a × b) + (a × c)- 乘法分配律:a × (b + c) = (a × b) + (a × c)例子以下是一些具体的分配律的计算题例子:1. 2 × (3 + 4) = (2 × 3) + (2 × 4)2. 3 × (4 + 5) = (3 × 4) + (3 × 5)结论交换律、结合律和分配律是数学运算中的基本法则,对于四年级的学生来说是必须掌握和理解的概念。
四年级练习题乘法交换律与结合律
![四年级练习题乘法交换律与结合律](https://img.taocdn.com/s3/m/0c5d1793ee06eff9aff8073a.png)
四年级上册第三单元——乘法交换律与结合律一、仔细想,认真填1、两个数相加,交换加数的,和不变,这叫做。
用字母表示为。
2、三个数相加,先把相加,再与相加;或者先把相加,再与相加,它们的和不变,这叫做。
用字母表示为。
3、两个数相乘,交换乘数的,积不变,这叫做。
用字母表示为。
4、三个数相乘,先把相乘,再与相乘;或者先把相乘,再与相乘,它们的积不变,这叫做。
用字母表示为。
5、用字母a、b、c表示下面运算定律:(l)加法交换律();(2)加法结合律();(3)乘法交换律();(4)乘法结合律()。
6、73+99+27=99+(73+27) 是根据加法( )律和( )律;9×125×8 =9×(125×8),这里运用了乘法( )律;(25×37)×4=37×(25×4)。
这里运用了乘法( )律和( )律。
4、在○里填>、<或=符号。
125×24○125×8×3 27×4×25○27×(4×25) 67×8○68×75、在□内填上数,在○内填上运算符号,在横线上填上运用的运算定律。
29+37+171=37+(□○□)。
42×5×8=42×(□○□)。
47+□=28○□。
427+39+73=(427+□)○□。
35×21×2=21×(□○□) 。
6、计算64×26后,可以交换两个乘数的位置进行验算,是运用了()律。
7、25×(20×39)=(25×20)×39 这是运用了()律。
8、用简便方法计算76+98+24,要先算(),这是根据()律。
二、对号入座:(把正确的答案的序号填在括号里)1、下面一个零也不读的数是( )。
A.600030B.603000C.6003002、与480×40的积一样的算式是( )。
乘法结合律和乘法交换律的题
![乘法结合律和乘法交换律的题](https://img.taocdn.com/s3/m/ba781d72a31614791711cc7931b765ce05087af7.png)
选择题根据乘法结合律,下列等式成立的是:A. (a * b) * c = a * (b + c)B. (a + b) * c = a * c + b * c(正确答案)C. a * (b * c) = a * b + a * cD. a * b * c = a + b + c下列哪个等式体现了乘法交换律?A. a * (b * c) = (a * b) * cB. a * b = b * a(正确答案)C. a * (b + c) = a * b + a * cD. a * 0 = 0使用乘法结合律简化表达式时,下列哪一步是正确的?A. (2 * 3) * 4 = 2 * (3 + 4)B. (2 * 3) * 4 = 2 * 3 + 4C. (2 * 3) * 4 = 2 * (3 * 4)(正确答案)D. (2 * 3) * 4 = 2 + 3 * 4乘法交换律适用于:A. 任何两个数的乘法(正确答案)B. 只有正数的乘法C. 只有整数的乘法D. 只有小数的乘法根据乘法交换律和结合律,下列等式简化后正确的是:A. (a * b) * c = a * c * b(正确答案)B. (a * b) * c = a + b * cC. a * (b * c) = a * b + cD. a * b * c = a * (b + c)在进行乘法运算时,改变因数的顺序,积不变,这是:A. 乘法分配律B. 乘法结合律C. 乘法交换律(正确答案)D. 乘法消去律下列哪个等式不是乘法结合律的应用?A. (m * n) * p = m * (n * p)B. (x * y) * z = x * y * z(虽简化但本质符合,此处作为干扰项)C. a * (b * c) = (a * b) * cD. s * (t + u) = s * t + s * u(正确答案,这是分配律)使用乘法交换律,下列哪个等式是正确的?A. 7 * 8 = 8 * 7(正确答案)B. 7 * 8 = 7 + 8C. 7 * (8 * 9) = (7 * 8) + 9D. 7 * 8 = 15。
- 1、下载文档前请自行甄别文档内容的完整性,平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益,请联系客服反馈,我们会尽快为您处理(人工客服工作时间:9:00-18:30)。
四年级上册第三单元
——乘法交换律与结合律
一、仔细想,认真填
1、两个数相加,交换加数的,和不变,这叫做。
用字母表示为。
2、三个数相加,先把相加,再与相加;或者先把相加,再与
相加,它们的和不变,这叫做。
用字母表示为。
3、两个数相乘,交换乘数的,积不变,这叫做。
用字母表示
为。
4、三个数相乘,先把相乘,再与相乘;或者先把相乘,再与相
乘,它们的积不变,这叫做。
用字母表示为。
5、用字母a、b、c表示下面运算定律:
(l)加法交换律();
(2)加法结合律();
(3)乘法交换律();
(4)乘法结合律()。
6、73+99+27=99+(73+27) 是根据加法( )律和( )律;
9×125×8 =9×(125×8),这里运用了乘法( )律;
(25×37)×4=37×(25×4)。
这里运用了乘法( )律和( )律。
4、在○里填>、<或=符号。
125×24○125×8×3 27×4×25○27×(4×25) 67×8○68×7
5、在□内填上数,在○内填上运算符号,在横线上填上运用的运算定律。
29+37+171=37+(□○□)。
42×5×8=42×(□○□)。
47+□=28○□。
427+39+73=(427+□)○□。
35×21×2=21×(□○□) 。
6、计算64×26后,可以交换两个乘数的位置进行验算,是运用了()律。
7、25×(20×39)=(25×20)×39 这是运用了()律。
8、用简便方法计算76+98+24,要先算(),这是根据()律。
二、对号入座:(把正确的答案的序号填在括号里)
1、下面一个零也不读的数是( )。
A.600030
B.603000
C.600300
2、与480×40的积一样的算式是( )。
A.48×40
B.480×400
C.48×400
3、用两个4和三个0可以组成( )个不同的五位数。
A.3
B.4
C.5
4、32+29+68+41=32+68+(29+41)这是根据( )。
A.加法交换律
B.加法结合律
C.加法交换律和结合律
5、49×25×4=49×(25×4)这是根据( )。
A.乘法交换律
B.乘法分配律
C.乘法结合律
6、下面算式中( )运用了乘法交换律和结合律。
A、(47×5)×12=47×(5×12)
B、a×b×a×c=a×(b×c)
C、4×a×5=a×(4×5)
三、计算
1、口算我最棒。
50×70= 40×30= 25×40= 160×3= 24×2=60×40= 200×7= 12×30= 22×40= 25×2=25×20= 48×20= 300×50= 180×6= 80—15=12×3= 320×3= 25×4= 50×2=210÷7=90×0= 30÷5= 200÷4= 18×4=125×37×8=598+99= 396—28—22= 369+43+57= 27×16+73×16=2、笔算下面各题。
列竖式计算。
128×46= 403×24= 130×35= 42×102= 305×24= 350×46= 123×37= 306×24= 308×32= 259×34= 20×369= 480×70= 345×54= 501×63= 280×19= 65×390=
四、用简便方法计算。
44+37+56 168+49+61 125×23×8 25×23×4 74+(137+326) 189+35+211+165 94+38+106+62 25×36×4 65×5×2 125×15×8 125×24 25×36
五、怎样简便就怎样算;
(1)127+352+73 (2)244+89+111 (3)26+71+74+29 (4)35×125×8 (5)97×25×4(6)125×18×8 (7)36×25(8)25×64×125 (9)44×25
六、用线段连一连
①35×2×5 A:18×(25×4)
②18×25×4 B:35×(2×5)
③22×30×44 C:60×30×20
④60×(20×30) D:22×(30×44)
⑤326×50×8 E:(42+68)+(99+1)
⑥42+99+68+1 F:326×(50×8)
七、根据运算定律,在□里填上适当的数。
(1)a+(30+8)=(□+□)+8
(2)□+28=□+18
(3)45×□=32×□
(4)(4+8)×25=□×□+□×□
八、把“>、<、=”填在合适的○里
496-120-230○496-(12+230) 192+(95-75)○192+95-75 198×8×l0○198×8+10 720÷36÷2○720÷(36÷2)18×4÷2○18×(4+2) 280-70+30○280-(70+30)70×3+5○70×(3+5)(65+13)×4○65×4+13。