小学数学计算专题(含答案)
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1.口算。
2.5×0.4÷2.5×0.4=0.16 67÷(1000)=0.067 1.25×0.8=1 0.1×10=1
3.6+4=7.6 0.4+2.5-2.5+0.4=0.8 6.7×(100)=670 2.5×0.4=1 0.1÷10=0.01
1-0.01=0.99
2.竖式计算。
20-8.9311.07 15.3+2.9718.27 9.8×2.0920.48223.75×0.6 14.255.4×3.7520.252.09×250522.5
(交换乘数位置)
3.脱式计算,(怎样简便怎样算)。
2.25+10.5+
3.75+2.5 9.97+7.69+2.31 75.6-1.8+2
4.4 7
5.6-1.8-5.6 75.6-1.8+8.2
=(2.25+3.75)+(10.5+2.5 ) =9.97+(7.69+2.31) =75.6+24.4-1.8 =75.6-5.6 -1.8 =73.8+8.2
=6+13 =9.97+10 =100-1.8 =70 -1.8 =82
=19 =19.97 =98.2 =68.2
53.7-4.25-5.75 53.7-(3.7+5.75) 56.8-(3.75+6.8)76.45-19.71-20.89 =53.7-(4.25+5.75) =53.7-3.7-5.75 =56.8-3.75-6.8 =56.74-20.89
=53.7-10 =50-5.75 =56.8-6.8-3.75 =35.85
=43.7 =44.25 =50-3.75
=46.25
0.25×3.2×1.25 1.25×(8×0.8) 44×25×3 2.5×4.4 45.74-12.4-2.6
=(0.25×4)×(0.8×1.25) =1.25×8×0.8 =(4×25) ×(11×3 ) =2.5×4×1.1
=45.74-(12.4+2.6)
=1×1 =10×0.8 =100 ×33 =10×1.1
=45.74-15
=1 =8 =3300 =11
=30.74
(答案不唯一)
0.65×6.4+0.65×3.6 7.8-7.8×0.7 0.56×99+0.56 2.6+1.4×3
2.6-0.6×3
=0.65×(6.4+3.6) =7.8×(1-0.7) =0.56×(99+1) =2.6+4.2 =2.6-1.8 =0.65×10 =7.8×0.3 =0.56×100 =6.8
=0.8
=6.5 =2.34 =56 (方法不唯一)
(前三题都运用“乘法分配律”进行简便计算)
3.47×9.9
4.58×10.1 2.22×999+6.66×667 (44-
5.4×3.75)×0.6 7.8×
6.5+
7.8×3.5
=3.47×(10-0.1) =4.58×(10+0.1) =6.66×333+6.66×667 =(44-20.25)×0.6 =7.8
×(6.5+3.5)
=3.47×10-3.47×0.1 =4.58×10+4.58×0.1 =6.66×(333+667) = 23.75×0.6 =7.8
×10
=34.7-0.347 =45.8+0.458 =6.66×1000 = 14.25 =78
=34.353 =46.258 =6660 (答案
不唯一)
(第4题直接脱式计算,其余4题都运用“乘法分配律”进行简便计算)
4.解方程。(一定要写“解:”)
x ÷0.5=0.5 x -5.02=15.02 4x=420 x +1.02=8.98 30.5-
x=9.5
x=0.25 x=20.04 x=105 x=7.96 x=21 2x +3.2=7.8 2x -7=97 24+3x =96 9x-3x=612 24-3x=6 x=2.3 x=52 x=24 x=102 x=6