小三甲 蘇家榆 數補 p14 乘法 05/16/98 星期六 天氣:晴 心情:高興 p14 9. 27*32 = 27*30+27*2 = 810+54 = 864 驗算: 864/32 = 27 10. 82*72 = 82*70+82*2 = 5740+164 = 5904 驗算: 5904/72 = 82 11. 36*90 = 36*90+36*9 = 3240 驗算: 3240/90 = 36 12. 37*16 = 37*10+37*6 = 370+222 = 592 驗算: 592/16 = 37 13. 76*12 = 76*10+76*2 = 760+152 = 912 驗算: 912/12 = 76 14. 74*71 = 74*70+74*1 = 5180+74 = 5254 驗算: 5254/71 = 74 15. 65*54 = 65*50+65*4 = 3250+260 = 3510 驗算: 3510/54 = 65 . 16. 35*41 = 35*40+35*1 = 1400+35 = 1435 驗算: 1435/41 = 35 17. 80*76 = 80*70+80*6 = 5600+480 = 6080 驗算: 6080/76 = 80 18. 52*30 = 52*30+52*3 = 1560 驗算: 1560/30 = 52 19. 17*45 = 17*40+17*5 = 680+85 = 765 驗算: 765/45 = 17 20. 30*13 = 30*10+30*3 = 300+90 = 390 驗算: 390/13 = 30 21. 65*16 = 65*10+65*6 = 650+390 = 1040 驗算: 1040/16 = 65 22. 55*56 = 55*50+55*6 = 2750+330 = 3080 驗算: 3080/56 = 55 23. 58*53 = 58*50+58*3 = 2900+174 = 3074 驗算: 3074/53 = 58 24. 99*19 = 99*10+99*9 = 990+891 = 1881 驗算: 1881/19 = 99 |
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