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①45+32+55 =45+55+32 =100+32 =132
②63+28+72+37 =63+37+28+72 =(63+37)+(28+72)=100+100 =200 2、减法 ①145-36-45 =145-45-36 =100-36 =64 ②283-56-44 =283-(56+44) =283-100 =183 ③197-(42+97) =197-97-42 =100-42 =58
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3、乘法 ①25×13×4 =25×4×13 =100×13 =1300 ②125×32×25 =125×(8×4)×25 =(125×8)×(4×25) =1000×100 =100000 ③24×102 =24×(100+2) =24×100+24×2 =2400+48 =2448 ④21×99 =21×(100-1) =21×100-21×1 =2100-21 ⑤(25+3)×4 =25×4+3×4 =100+12 =112
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⑥56×23+44×23 =(56+44)×23 =100×23 =2300
⑦178×45-45×78 =(178-78)×45 =100×45 =4500 ⑧34×99+34 =34×(99+1) =34×100 =3400
⑨78×12+21×12+12 =(78+21+1)×12 =100×12 =1200 4、除法 ①3000÷125÷8 =3000÷(125×8)=3000÷1000
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=3 ②810÷18 =810÷(9×2) =810÷9÷2 =90÷2 =45
③720÷18÷4 =720÷(18×4)=720÷72 =10
④630÷(21×2)=630÷21÷2 =30÷2 =15
三、加减凑整法 ①145+201 =145+200+1 =345+1 =346 ②234+98 =234+100-2 =334-2 =332
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