最新四年级数学乘法结合律练习题
四年级乘法交换律和结合律强化训练题
小学四年级数学上册乘法交换律与结合律专项训练知识要点：123x 99 +123125 x 7+12579 x 99+79二、计算下列各题能简算要简算35x 10247x 10125x 4498x 37 87x 199 25x 19945x 201－45 38x 101－38 25x 199+2599x 201－99102x 83 125x 88乘法分配律 （a+b ） x c=a x c+b x c 乘法交换律 axb=b x a 一、计算下列各题 乘法结合律 (a >b) X c=a x (b >C) 加法结合律 (a+b)+c=a+(b+c)(25 x 125)x( 8X 4) (4+8)x 25 35x 37+65x 37135x 6+65x 6 43+25)x 40 8x( 125+7)18x 82+18x 47+18x 712 5x( 40－ 4) 16x 256－16 x 56125x( 80+8)69x 45+31 x 45 38x 29+384X 24+26X 24 30X 2+25X 2 (30X 25)X 4033X 15X 2 25 X 7X 4X 325X 50X 8 25 X 125X 16125X 32X 25 4X (25 X 9)16X 25X 12538X 5X 45X (19 X 2) 4X 45X 2525X 23X 8 125 X 72(25 X 125) X 32(30X 25) X 40(15X 25) X 415X (25 X 4)(6 X 12) X 56X (12 X 5)(13X 5) X 205 X (13 X20)125X 4835X 2X 5(60X 25) X 4125X 5X 864X 125125X 3225X 35X 16 125X 24124 X 25-25 X 24 (80+8)X 25 35X 37+65X 37135X 6+65X 643+25)X 40 8X ( 125+7)18X 82+18X 47+18X 71三、直接写得数25 X4= 4 25X 5X2= 12 5= (15X25) X4 =6 X12 X5)=8 125= 20 X5= 50 4=(6 X12) X5=13 (5 X20)=四、用简便方法计算4 X8 X25X12535 X2 X5=35 X( 2 J)125 X5 X8= (__ X_) X5(8 刈25)125 X8 X8 42 XI25 X8 25 X6 X4 (25 X4) X6 8X(7X2 5)125 X32 64 M25 2 5 XI(60X25)i X4=60 X(_ X _) X (4X25)8 X4 X125 X25 125X8 X4125 X16 16 252 2 7X4 X5125X 16 16X 25 56 X12525 X12836 X2525 X 12 25 X 24 X 5 28 X 25299X 120+120 38 X25 X4 8 X17 XI2523 X 3= 70 X5=13X100= 25 X4=125 X8= 125 X8=4 ><50=15X( 25X4)=(13 X5) X20=2 X50=1、 ① （36+64 ） X13 与 ② 36 X13+64 X 132、 ① 135 X 15+65 X 15 与②（135+65 ） X 153、 ① 101 X45 与② 100 X45+1 X 454、 ① 125 X 842 与② 125 X800+125 X 40+125 X2 二、判断下面的 5 组等式，应用乘法分配律用对的打1、 （7+8+9） X 10=7X 10+8X 10+92、 12X 9+3X 9 = 12+3 X 93、 （25+50） X 200 = 25 X 200+504、 101 X 63=100 X 63+635、 98 X 15= 100 X 15 + 2 1X 5） ） （） （）V ；应用错的打 （） （） （） （） ）80+8 ） X 2532 （X 200+3 ）38 39X +383528X + 7020X 17X 2X 5X 2X 21 10 X 2+90 X 2（110+90）X 2 12 X 105乘法分配律练习题 138X 62+38X 38 75X 14—70X 14101X 3812 X 98 55 X 99+55 55X 9912X 29+12 58X 199+58 42X 79+4252X 89 69X 101—69 55X 21—55125X （ 80+8） 125X （ 80X 8）125 X 32X 25乘法分配律练习题 2、选择。
(完整版)四年级乘法交换律和结合律强化训练题
小学四年级数学上册乘法交换律与结合律专项训练知识要点：乘法分配律(a+b)×c=a×c+b×c 乘法结合律(a×b)×c=a×(b×c)乘法交换律a×b=b×a 加法结合律(a+b)+c=a+(b+c)一、计算下列各题（25×125）×（8×4）（4+8）×25 35×37+65×37 135×6+65×6 （43+25）×40 8×（125+7）18×82+18×47+18×712 5×（40－4）16×256－16×56 125×（80+8）69×45+31×45 38×29+38123×99 +123 125 ×7+125 79 ×99+79二、计算下列各题能简算要简算35×102 47×101 25×4498×37 87×199 25×19945×201－45 38×101－38 25×199+25 99×201－99 102×83 125×88124×25－25×24 （80+8）×25 35×37+65×37135×6+65×6 （43+25）×40 8×（125+7）18×82+18×47+18×71 4×24+26×24 30×2+25×2 （30×25）×4033×15×2 25×7×4×3 25×50×8 25×125×16 125×32×254×(25×9) 16×25×125 38×5×45×(19×2) 4×45×25 25×23×8 125×72 (25×125)×32 (30×25)×40 (15×25)×4 15×(25×4) (6×12)×5 6×(12×5) (13×5)×20 5×(13×20) 125×48 35×2×5 (60×25)×4 125×5×8 64×125 125×32 25×35×16 125×24125×16 16×25 56×125 25×12836×25 25×12 25×24×5 28×25三、直接写得数25×4= 4×25= 125×8= 8×125= 20×5=5×12= 12×5= 4×50= 50×4= 2×50=（15×25）×4 = 15×（25×4）= （6×12）×5=6×（12×5）= （13×5）×20= 13×（5×20）=四、用简便方法计算299×120+120 38×25×4 8×17×1254×8×25×125 35×2×5=35×（2×）（60×25）×4=60×（×）125×5×8=（×）×5 （8×125）×（4×25）8×4×125×25125×8×8 42×125×8 25×6×4 125×8×4（25×4）×6 ８×（７×２５）125×16 16×25125×32 64×125 ２５×１２２７×４×５23×3= 70×5= 13×100= 25×4= 125×8=195×25×4 2×125×8×5 125×489×420×17×2×5×2×2 110×2+90×2 （110+90）×2 12×105乘法分配律练习题138×62+38×38 75×14—70×14 101×3812×98 55×99+55 55×9912×29+12 58×199+58 42×79+4252×89 69×101—69 55×21—55125×（80+8）125×（80×8）125×32×2599×99+99 38×7+31×14 25×46+50×27 79×25+22×25—25乘法分配律练习题2一、选择。
小学四年级数学下册练习题乘法交换律和结合律(共400题)
月 日 姓名: 分 秒 班级:
58 25 4
19000 25 4
4800 25 4
2300 25 4
4600 25 4
1100 25 4
9000 8 125
700 25 4
25 79 4
4300 25 4
25 16 4
4100 25 4
25 33 4
11000 4 25
25 91 4
15000 8 125
4000 25 4
125 8 8
1700 25 4
39 25 4
700 25 4
25 19 4
900 25 4
10000 125 8
11000 125 8
93 25 4
25 53 4
4
小学四年级数学下册练习题 《乘法交换律和结合律》 题数：400题
25 76 4
2100 25 4
月 日 姓名: 分 秒 班级:
400 25 4
125 9 8
1400 25 4
2000 125 8
25 69 4
25 59 4
16000 25 4
125 19 8
73 25 4
25 2 4
25 17 4
25 96 4
24 25 4
45 25 4
25 6 4
4 125 8
68 25 4
25 78 4
8
小学四年级数学下册练习题 《乘法交换律和结合律》 题数：400题
84 25 4
125 14 8
月 日 姓名: 分 秒 班级:
25 55 4
10000 25 4
25 35 4
500 25 4
6000 25 4
四年级下口算题 (乘法交换律和结合律) 1000题
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 =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 × 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 =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 =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 =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 =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 =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 × 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 =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 =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 × 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 =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 =练习范围：乘法交换律和结合律 题数：100月日姓名: 分秒成绩: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 =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 =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 × 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 =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 =练习范围：乘法交换律和结合律 题数：100月日姓名: 分秒成绩: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 =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 =练习范围：乘法交换律和结合律 题数：100月日姓名: 分秒成绩: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 =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 =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 ÷ 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 =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 =练习范围：乘法交换律和结合律 题数：100月日姓名: 分秒成绩: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 =。
(完整版)乘法运算定律专项练习题
四年级乘法运算定律专项练习姓名：一、乘法交换律、乘法结合律1、乘法交换律：交换两个因数的地址，积不变。
用字母表示为： a × b ＝ b × a2 、多个数相乘，任意交换因数的地址，积不变。
如 a × b × c × d ＝ b × d × a × c3、乘法结合律：三个数相乘，先乘前两个数，也许先乘后两个数，积不变。
永宁字母表示为：（ a × b ）× c ＝ a ×（ b × c ）4、在乘法算式中，若是其中两个因数的积为整十、整百、整千数时，可以运用乘法交换律、乘法结合律来改变运算序次，从而简化运算。
二、乘法交换律、乘法结合律的结合运用1、运用乘法交换律、乘法结合律简化运算的本质与算式特点本质：把其中相乘结果为整十、整百、整千的两个因数先相乘。
平时利用的算式是：2 × 5 ＝ 10 ； 4 × 25 ＝ 100 ； 8 × 125 ＝ 1000 ； 25 × 8 ＝ 200 ； 75× 4 ＝ 300 ； 75 × 4 ＝ 300这类题型特点是几个数连续相乘2、简略计算。
8 ×（ 30 × 125 ） 5 ×（ 63 × 2 ）25 ×（ 26 × 4 ）（ 25 × 125 ）× 8 × 478 × 125 × 8 × 3 25 × 125 × 8 × 4 125 × 19 × 8 × 3（125× 12）× 8（25× 3）× 43、在乘法算式中，当因数中有25 、 125 等因数，而别的的因数没有 4 或 8 时，可以考虑将别的一个数拆分为 4 或 8 的形式，从而利用乘法交换律、乘法结合律使运算简化。
小学四年级数学：乘法结合律和乘法分配律+练习
一、乘法结合律1、乘法结合律：三个数相乘；先把前两个数相乘；再和第三个数相乘；或者先把后两个数相乘；再和第一个数相乘；它们的积不变.用字母表示是：（a×b）×c=a×(b ×c).2、使用时机：当几个数相乘时；如果其中两个数相乘得整十、整百、整千的数就可以应用乘法交换律和乘法结合律.乘法结合律可以改变乘法运算中的顺序.数字如;25和4、50和2、125和8、50和4、500和2等.二、乘法分配律1、乘法分配律：两个数的和（或差）与一个数相乘；可以把两个加数（或被减数、减数）分别与这个数相乘；在把两个积相加（或相减）；结果不变.用字母表示数：（a+b）×c=a×c+b×c或（a-b）×c=a×c－b×c补充知识点：1、式子的特点：式子的原算符号一般是×、+(-)、×的形式；在两个乘法式子中；有一个相同的因数；另为两个不同的因数之和(或之差)基本上是能凑成整十、整百、整千的数.2、102×88、99×15这类题的特点：两个数相乘；把其中一个比较接近整十、整百、整千的数改写成整十、整百、整千与一个数的和（或差）；再应用乘法分配律可以使运算简便.练习题：类型一：（注意：一定要括号外的数分别乘括号里的两个数；再把积相加）（40＋8）×25 125×（8+80）36×（100+50） 24×（2＋10）86×（1000－2） 15×（40－8）类型二：（注意：两个积中相同的因数只能写一次）36×34＋36×66 75×23＋25×2363×43＋57×63 93×6＋93×4325×113－325×13 28×18－8×28类型三：（提示：把102看作100＋1；81看作80＋1；再用乘法分配律）78×102 69×10256×101 52×102125×81 25×41类型四：（提示：把99看作100－1；79看作80－1；再用乘法分配律）31×99 42×98 29×9985×98 125×79 25×39类型五：（提示：把56看作56×1；再用乘法分配律）83＋83×99 56＋56×9999×99＋99 75×101－75125×81－125 91×31－91。
乘法结合律试卷
乘法结合律试卷篇一：小学四年级乘法结合律练习题四年级下册数学乘法结合律专项练习题姓名：1、我会填①400×______×8 = 400×(15×8)②(a×b)×c = a×(_____×_____)③35×______ = 46×_______ ④45×5×4 = 45×(______×_____) ⑤125×32×25 = (125×______)×(_____×_______)⑥a×b = _____×_____2、符合乘法交换律的画○符合结合律的画△①35×28=28×35 ( ) ②32×25=8×(4×25)( ) ③25×15×4×2=(15×2)×(25×4) ( ) ④ a×b×c=a×c×b ( )3、算一算，想一想，你有什么发现？(1)30×2×5= (2)25 ×16 ×4=4、连一连5、简算33×15×2125×32×255×(19×2)(25×125)×32(30(6×12)×56125×483530×(2×5)= (25 ×4)×16= 45×18 4×45×25 125×16 45+18+55 25×7×4×3 4×(25×9)4×45×25 ×25)×40 ×(12×5) (13×2×5 (60我发现：我发现：×8×2 ×(25×4) ×45 25×50×8 25×125×16 16×25×125 38×5×4 25×23×8 125×72 ×25)×4 15×(25×4) ×5)×20 5×(13×20) ×25)×4125×5×8 18+(55+45)125 45 18 (1564×125125×32 25×35×16125×24125×16 16×25 56×125 25×12836×2525×12 25×24×528×25六、解决问题。
四年级乘法交换律和结合律强化训练题精修订
四年级乘法交换律和结合律强化训练题GE GROUP system office room 【GEIHUA16H-GEIHUA GEIHUA8Q8-小学四年级数学上册乘法交换律与结合律专项训练知识要点：乘法分配律(a+b)×c=a×c+b×c 乘法结合律(a×b)×c=a×(b×c)乘法交换律a×b=b×a 加法结合律 (a+b)+c=a+(b+c)一、计算下列各题（25×125）×（8×4）（4+8）×25 35×37+65×37135×6+65×6 （43+25）×40 8×（125+7）18×82+18×47+18×712 5×（40－4） 16×256－16×56125×（80+8） 69×45+31×45 38×29+38123×99 +123 125 ×7+125 79 ×99+79二、计算下列各题能简算要简算35×102 47×101 25×4498×37 87×199 25×19945×201－45 38×101－38 25×199+2599×201－99 102×83 125×88124×25－25×24 （80+8）×25 35×37+65×37135×6+65×6 （43+25）×40 8×（125+7）18×82+18×47+18×71 4×24+26×24 30×2+25×2 （30×25）×4033×15×2 25×7×4×3 25×50×825×125×16125×32×254×(25×9) 16×25×12538×5×45×(19×2) 4×45×25 25×23×8125×72(25×125)×32 (30×25)×40 (15×25)×415×(25×4)(6×12)×5 6×(12×5) (13×5)×20 5×(13×20)125×48 35×2×5 (60×25)×4 125×5×864×125 125×32 25×35×16 125×24125×16 16×25 56×12525×12836×25 25×12 25×24×5 28×25三、直接写得数25×4= 4×25=125×8=8×125=20×5=5×12= 12×5=4×50=?50×4=2×50=（15×25）×4?= 15×（25×4）= （6×12）×5=6×（12×5）= （13×5）×20= 13×（5×20）=四、用简便方法计算299×120+120 38×25×4?8×17×125?4×8×25×12535×2×5=35×（2×）（60×25）×4=60×（×）125×5×8=（×）×5（8×125）×（4×25）8×4×125×25?125×8×842×125×825×6×4 125×8×4（25×4）×6８×（７×２５）125×16 16×25125×3264×125２５×１２２７×４×５23×3= 70×5=? 13×100=? 25×4=? 125×8=195×25×4 2×125×8×5 125×489×420×17×2×5×2×2110×2+90×2（110+90）×212×105乘法分配律练习题138×62+38×38 75×14—70×14 101×3812×98 55×99+55 55×9912×29+12 58×199+58 42×79+42 52×89 69×101—69 55×21—55125×（80+8） 125×（80×8） 125×32×25 99×99+99 38×7+31×14 25×46+50×27 79×25+22×25—25乘法分配律练习题2一、选择。
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加拿大ｂｅａｄｗｏｒｋｓ公司就是根据年轻女性要充分展现自己个性的需求，将世界各地的珠类饰品汇集于“碧芝自制饰品店”内，由消费者自选、自组、自制，这样就能在每个消费者亲手制作、充分发挥她们的艺术想像力的基础上，创作出作品，达到展现个性的效果。125x16 45x(25x4)
45+18+55 18x45
众上所述，我们认为：我们的创意小屋计划或许虽然会有很多的挑战和困难，但我们会吸取和借鉴“漂亮女生”和“碧芝”的成功经验，在产品的质量和创意上多下工夫，使自己的产品能领导潮流，领导时尚。在它们还没有打入学校这个市场时，我们要巩固我们的学生市场，制作一些吸引学生，又有使学生能接受的价格，勇敢的面对它们的挑战，使自己立于不败之地。45x18 18+(55+45)
乘法结合律评研题
姓名：学号：书写：5 3 1完成：5 3 1
1、
2、图1-3大学生偏爱的手工艺品种类分布我会填
（1）A×b=_____×_____
（2）(a×b)×c=a×(____×_____)
（3）
（4）标题：上海发出通知为大学生就业—鼓励自主创业，灵活就业2004年3月17日35×______=46×_______
（5）45×5×4=45×(______×__店的分析125×32×25=(125×______)×(_____×_______)
（8）
（9）6、你购买DIY手工艺制品的目的有那些？400×______×8=400×(15×8)
3、
4、（1）专业知识限制连一连
3、简算
33×15×2 25×7×4×3 25×50×8
（3）个性体现
25×125×16 4×(25×9) 16×25×125
十字绣□编制类□银饰制品类□串珠首饰类□