小学数学五年级简便计算题及答案
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五年级数学简便计算题及答案
3.29+0.73+2.27 3.29-0.73-2.27 7.5+2.5-7.5+2.5
7.325-3.29-3.325 7.325-(5.325+1.7) 3.29+0.73-2.29+2.27
3.29×0.25×40.125×8.80.25×0.28
0.125×3.2×2.535×10.20.25×4÷0.25×4
3.5×101-3.5 3.5×9.9+3.5×0.1 3.5×2.7+35×0.73
3.5×2.7-3.5×0.7(32+5.6)÷0.8 3.5÷0.6-0.5÷0.6
4.9÷1.47÷0.25÷47÷0.125
7.35÷(7.35×0.25)7.35÷(7.35÷0.25)
3.07-0.38-1.62 1.29+3.7+2.71+6.3
8-2.45-1.55 3.25+1.79-0.59+1.75
23.4-0.8-13.4-7.2 0.32×403
3.2+0.36+
4.8+1.64 1.23+3.4-0.23+6.6 0.25×36
12.7-(3.7+0.84)36.54-1.76-4.54 0.25×0.73×4 7.6×0.8+0.2×7.60.85×1990.25×8.5×4 1.28×8.6+0.72×8.612.5×0.96×0.810.4-9.6×0.35
0.8×(4.3×1.25) 3.12+3.12×9928.6×101-28.6 (4.23+6.17)×0.80.86×15.7-0.86×14.7 2.4×102
14-7.32-2.68 2.64+8.67+7.36+11.33
答案
3.29+0.73+2.27 3.29-0.73-2.27 7.5+2.5-7.5+2.5
=3.29+(0.73+2.27)=3.29-(0.73+2.27)=(7.5-7.5)+(2.5+2.5)=3.29+3 =3.29-3 =0+5
=6.29 =0.29 =5
(加法结合律)(减法的性质)(同级运算交换)
7.325-3.29-3.325 7.325-(5.325+1.7)
=7.325-3.325-3.29 =7.325-5.325-1.7
=4-3.29 =2-1.7
=0.71 =0.3 (减法交换)
(减法的性质)
3.29+0.73-2.29+2.27 3.29×0.25×40.125×8.8
=(3.29-2.29)+(0.73+2.27)=3.29×(0.25×4)=0.125×8×1.1
=1+3 =3.29×1=1×1.1
=4 =3.29 =1.1
(同级运算交换)(乘法结合律)(先拆数,乘法结合律)0.25×0.280.125×3.2×2.535×10.2
=0.25×4×0.07=(0.125×8)×(0.4×2.5)=35×(10+0.2)
=1×0.07=1×1=35×10+35×0.2
=0.07 =1 =350+7 (先拆
数,乘法结合律)(拆数,乘法结合律)=357
(拆数,乘法分配律)0.25×4÷0.25×4
=(0.25÷0.25)×(4×4)
=1×16
=16
(同级运算交换)
3.5×101-3.5 3.5×9.9+3.5×0.1★3.5×2.7+35×0.73
=3.5×(101-1)=3.5×(9.9+0.1)=3.5×2.7+3.5×7.3
=3.5×100=3.5×10=3.5×(2.7+7.3)
=350 =35 =3.5×10 (乘法分配
律)(乘法分配律)=35
(先利用积不变的规律转化,
然后再用乘法分配律)
3.5×2.7-3.5×0.7★(32+5.6)÷0.8★3.5÷0.6-0.5÷0.6
=3.5×(2.7-0.7)=32÷0.8+5.6÷0.8=(3.5-0.5)÷0.6
=3.5×2=40+7 =3÷0.6
=7 =47 =5
(乘法分配律)(后2题类似分配律,但只适用于(a+b)÷c
和(a-b)÷c,而a÷(b+c)和a÷(b-c)不能用。
)
4.9÷1.47÷0.25÷4★7÷0.125
=4.9÷(7×0.2)=7÷(0.25×4)=7×8
=4.9÷7÷0.2=7÷1=56
=0.7÷0.2=7 (乘除法转化规律,转化时
=3.5 符号相反,转化前后的2数
(拆数,除法的性质)(除法的性质)相乘得1。
)
7.35÷(7.35×0.25)★7.35÷(7.35÷0.25)
=7.35÷7.35÷0.25=7.35÷7.35×0.25
=1÷0.25=1×0.25
=4 =0.25
(除法的性质)(前面是除号,脱括号符号相反)
3.07-0.38-1.62 1.29+3.7+2.71+6.3 8-2.45-1.55
=3.07-(0.38+1.62)=(1.29+2.71)+(3.7+6.3)=8-(2.45+1.55)
=3.07-2 =4+10 =8-4
=1.07 =14 =4
(减法的性质)(加法交换律和加法结合律)(减法的性质)
3.25+1.79-0.59+1.75 23.4-0.8-13.4-7.2 0.32×403
=(3.25+1.75)+(1.79-0.59)=(23.4-13.4)-0.8-7.2 =0.32×(400+3)
=5+1.2 =10-(0.8+7.2)=0.32×400+0.32×3
=6.2 =10-8 =128+0.96
(同级运算交换)=2 =128.96
(减法交换和减法的性质)(拆数,乘法分配律)
3.2+0.36+
4.8+1.64 1.23+3.4-0.23+6.6 0.25×36
=(3.2+4.8)+(0.36+1.64)=(1.23-0.23)+(3.4+6.6)=0.25×4×9
=8+2 =1+10 =1×9
=10 =11 =9
(加法交换律和加法结合律)(同级运算交换)(拆数,乘法结合律)12.7-(3.7+0.84)36.54-1.76-4.54 0.25×0.73×4
=12.7-3.7-0.84 =36.54-4.54 -1.76 =0.25×4×0.73
=9-0.84 =32-1.76 =1×0.73
=8.14 =30.24 =0.73
(减法的性质)(减法交换)(乘法交换律和乘法结合律)7.6×0.8+0.2×7.60.85×1990.25×8.5×4
=7.6×(0.8+0.2)=0.85×(200-1)=0.25×4×8.5
=7.6×1=0.85×200-0.85×1=1×8.5
=7.6 =170-0.85 =8.5
(乘法分配律)=169.15 (乘法交换律和乘法分配律)
(拆数,乘法分配律)
1.28×8.6+0.72×8.61
2.5×0.96×0.810.4-9.6×0.35
=(1.28+0.72)×8.6 =12.5×0.8×0.96=10.4-3.36
=2×8.6=10×0.96=7.04 =17.2
=9.6 (无简算)(乘法分配律)(乘法交换律和乘
法结合律)
0.8×(4.3×1.25) 3.12+3.12×9928.6×101-28.6
=0.8×1.25×4.3=3.12×(1+99)=28.6×(101-1)=1×1.25=3.12×100=28.6×100
=1.25 =312 =2860
(乘法交换律和乘法结合律)(乘法分配律)(乘法分配律)
(4.23+6.17)×0.8 0.86×15.7-0.86×14.7 2.4×102
=10.4×0.8=0.86×(15.7-14.7)= 2.4×(100+2)
=8.32 =0.86×1=2.4×100+2.4×2(无简算)=0.86 =240+4.8
(乘法分配律)=244.8
(拆数,乘法分配律)14-7.32-2.68 2.64+8.67+7.36+11.33
=14-(7.32+2.68)=(2.64+7.36)+(8.67+11.33)
=14-10 =10+20
=4 =30
(减法的性质) (加法交换律和加法结合律)。