小学整数、小数四则运算50题附答案.doc

整数、小数四则运算、简便运算题
175－75÷25 68＋35×13　 725－（125＋237）
=175-3 =68+455 =725-362
=172 =523 =363
（114＋166）÷35 432÷（9×8） 189－60＋40
=280÷35 =432÷72 =129+40
=8 =6 =169
216＋305÷5 47＋236＋64 5+25×44
=216+61 =47+(236+64) =5+25×(40+4)
=277 =47+300 =5+25×40+25×4
=347 =5+1000+100
=1105
102×99 8+2×125 645-180-245
=102×(100-1) =8+250 =645-245-180
=102×100-102 =258 =400-180
=10200-102 =220
=10098
382×101-382 4×60×50×8 35×8+35×6-4×35
=382×(101-1) =(4×50) ×(60×8) =35×(8+6-4)
=382×100 =200×480 =35×10
=38200 =96000 =350

0.175÷0.25×4 0.175÷0.25÷0.4 200÷［（172－72）÷25］
=0.7×4 =0.175÷(0.25×0.4) =200÷[100÷25]
=2.8 =0.175÷0.1 =200÷4
=1.75 =50

630×［840÷（240－212）］ 800÷25 2000÷125
=630×[840÷28] =800÷100×4 =2000÷1000×8
=630×30 =8×4 =2×8
=18900 =32 =16

25×63×4 9000÷125 99×11
=(25×4) ×63 =9000÷1000×8 =(100-1) ×11
=100×63 =9×8 =1100-11
=6300 =72 =1089

794－198 68×25 72×125
=794-200+2 =17×4×25 =9×8×125
=594+2 =17×(4×25) =9×(8×125)
=596 =17×100 =9×1000
=1700 =9000

97×360＋3×360 124×25－25×24
=360×(97+3) =25×(124-24)
=360×100 =25×100
=36000 =2500
2800÷ 100＋789 75÷〔138÷（100-54）〕 85×(95－1440÷24)
=28+789 =75÷[138÷46] =85×(95-60)
=817 =75÷3 =85×35
=25 =2975

240×78÷（154-115） 80400－(4300＋870÷15) 1437×27＋27×563
=240×78÷39 =80400-(4300+58) =27×(1437+563)
=240×(78÷39) =80400-4358 =27×2000
=240÷2 =76042 =54000
=480
[75-（12+18）]÷15 (6.8-6.8×0.55)÷8.5 7.2÷0.8-1.2×5
=[75-30] ÷15 =(6.8-3.74) ÷8.5 =9-6
=45÷15 =3.06÷8.5 =3
=3 =0.36
0.12× 4.8÷0.12×4.8 95÷（64-45） 6.5×（4.8-1.2×4）
=(0.12÷0.12) ×4.8×4.8 =95÷19 =6.5×(4.8-4.8)
=1×4.8×4.8 =5 =6.5×0 =0
=23.04

25×32×125 　　7300÷25÷4 8100÷4÷75
=(25×4) ×(125×8) =7300÷(25×4) =8100÷(4×75)
=100×1000 =7300÷100 =8100÷300
=100000 =73 =27
32×(25+125) 78×101－78 　　84×36+64×84 　
=4×8×25+4×8×125 =78×(101-1) =84×(36+64)
=800+4000 =78×100 =84×100
=4800 =7800 =8400

98×199 75×99+2×75 83×102－83×2 　　　　
=98×(200-1) =75×(99+2) =83×(102-2)
=19600-98 =75×101 =83×100
=19502 =75×(100+1) =8300
=7500+75
=7575

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