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1、56+31+24 =(56+24)+31 =80+31 =111 2、615+475+125 =615+(475+125) =615+600 =1215
3、125×64 =125×8×8 =1000×8 =8000
4、 89+101+111 =101+(89+111) =101+200 =301
5、24+127+476+573 =(24+476)+(127+573) =500+700 =1200 6、400-273-127 =400-(273+127) =400-400 =0
7、327+(96-127) =327-127+96 =200+96 =296
8、70×98 =70×(100-2) =7000-140 =6860 9、442-103-142 =442-142-103 =300-103 =197
10、999+99+9 =1000+100+10-3 =1110-3 =1107
11、67×5×2 =67×(5×2) =67×10 =670 12、25×(78×4) =25×4×78 =100×78 =7800 13、72×125 =9×(8×125) =9×1000 =9000 14、9000÷125÷8 =9000÷(125×8) =9000÷1000 =9
15、400÷25 =400÷100×4 =4×4 =16 16、25×36 =25×4×9 =100×9 =900 17、103×27 =(100+3)×27 =2700+81 =2781
18、76×102 =76×(100+2) =7600+152 =7752
19、3600÷25÷4 =3600÷(25×4) =3600÷100 =36
20、99×35 =(100-1)×35 =3500-35 =3465
3、125×64 =125×8×8 =1000×8 =8000
4、 89+101+111 =101+(89+111) =101+200 =301
5、24+127+476+573 =(24+476)+(127+573) =500+700 =1200 6、400-273-127 =400-(273+127) =400-400 =0
7、327+(96-127) =327-127+96 =200+96 =296
8、70×98 =70×(100-2) =7000-140 =6860 9、442-103-142 =442-142-103 =300-103 =197
10、999+99+9 =1000+100+10-3 =1110-3 =1107
11、67×5×2 =67×(5×2) =67×10 =670 12、25×(78×4) =25×4×78 =100×78 =7800 13、72×125 =9×(8×125) =9×1000 =9000 14、9000÷125÷8 =9000÷(125×8) =9000÷1000 =9
15、400÷25 =400÷100×4 =4×4 =16 16、25×36 =25×4×9 =100×9 =900 17、103×27 =(100+3)×27 =2700+81 =2781
18、76×102 =76×(100+2) =7600+152 =7752
19、3600÷25÷4 =3600÷(25×4) =3600÷100 =36
20、99×35 =(100-1)×35 =3500-35 =3465
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