整数乘除法简便计算分类练习题 1、凑整 25×32×125 =(25×4)×(8×125) =100×1000
=10000
0 937×125×25×64×5
=937×(125×8) ×(25×4) ×(5×2)
=937×1000×100×10 =937000000 80×16×25×125
=(80×125) ×(25×4) ×4 =10000×100×4 =4000000 125×5×32×5
=(125×8) ×(5×2) ×(5×2) =1000×10×10 =100000 56×125 =7×(8×125) =7×1000 =7000
2、利用乘法分配律简算 46×101
=46×(100+1) =46×100+46×1 =4600+46 =4646 17×999 =17×(1000-1) =17000-17
=16983 125×98
=125×(100-2) =12500-250 =12250 37×99 =37×(100-1) =3700-37
=3663 234×102 =234×(100+2) =23400+468
=23868 (100-4)×25 =100×25-4×25 =2500-100
=2400 3、逆用乘法分配律简算95×71+95×29
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=95×(71+29) =95×100 =9500 64×25+35×25+25 =25×(64+35+1) =25×100 =2500
123×235-24×235+235 =235×(123-24+1) =235×100 =235
586×124+29×586-586×53 =586×(124+29-53) =586×100 =58600
62×38+38×38 =38×(62+38) =38×100 =3800
54×154-45×54-54×9 =54×(154-45-9) =54×100 =5400
67×12+67×35+67×52+67 =67×(12+35+52+1) =67×100
=6700
4、利用商不变的性质简算(分子分母同时乘以相同的数、商不变) 21000÷125
= 21000×8÷(125×8) =168000÷1000 =168 110÷5 =110×2÷(5×2) =220÷10 =22 44000÷125
=44000×8÷(125×8) =352000÷1000 =352 47700÷900
=47700÷100÷(900÷100) =477÷9 =53
5、利用除法分配律简算 (99+88)÷11 = 99÷11+88÷11 =9+8 =17 25÷13+14÷13 =(25+14) ÷13
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=39÷13 =3 13÷9+5÷9 =(13+5) ÷9 =18÷9 =2
31÷5+32÷5+33÷5+34÷5 =(31+32+33+34) ÷5 =130÷5 =26
187÷12-63÷12-52÷12 =(187-63-52) ÷12 =72÷12 =6
(12+24+36+48)÷6 =12÷6+24÷6+36÷6+48÷6 =2+4+6+8 =20 21÷5-6÷5 =(21-6) ÷5 =15÷5 =3
6、利用乘除法的带符号“搬家”进行简算 360×40÷60 =360÷60×40
=6×40 =240 99×88÷33÷22
=(99÷33) ×(88÷22) =3×2 =6 27×8÷9 =27÷9×8 =3×8 =24 6÷8×4 =6×4÷8 =24÷8 =3
7、乘除同级运算的去括号法则5×(4×43) =25×4×43 =100×43 =4300
45000÷(25×90) =45000÷90÷25 =500÷25 =20 125×(8×37) =125×8×37 =1000×37
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=37000
562×397÷(281×397) =(562÷281) ×(397÷397) =2×1 =2 5600÷(1400÷4) =5600÷1400×4 =4×4 =16
8、乘除同级运算的括号法则 31000÷8÷125 =31000÷(8×125) =31000÷1000 =31
1320×500÷250 =1320×(500÷250) =1320×2 =2640 35×222÷111 =35×(222÷111) =35×2 =70
37500÷4÷25 =37500÷(4×25) =37500÷100 =375
61000÷125÷8 =61000÷(125×8) =61000÷1000 =61
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