小三假 蘇家榆 數補 乘法 p13 05/10/98 11. 22*68 = 22*60+22*8 = 1320+176 = 1496 驗算: 1496/68 = 22 12. 24*22 = 24*20+24*2 = 480+48 = 528 驗算: 528//22 = 24 13. 63*33 = 63*30+63*3 = 1890+189 = 2089 驗算:2089/33 = 63 14. 61*46 = 61*40+61*6 = 2440+366 = 2806 驗算:2806/46 = 61 15. 63*21 = 63*20+63*1 = 1260+63 = 1323 驗算: 1323/21 = 63 16. 69*43 = 69*40+69*3 = 2760+207 = 2967 驗算: 2967/43 = 69 17. 25*27 = 25*20+25*7 = 500+175 = 675 驗算: 675/27 = 25 18. 41*90 = 41*90+41*9 = 3690 驗算: 3690/90 = 41 19. 19*25 = 19*20+19*5 = 380+95 = 475 驗算: 475/25 = 19 20. 40*48 = 40*40+40*8 = 1600+320 = 1920 驗算: 1920/48 = 40 21. 39*39 = 39*30+39*9 = 1170+351 = 1521 驗算: 1521/39 = 39 22. 66*54 = 66*50+66*4 = 3300+264 = 3564 驗算: 3564/54 = 66 23. 59*62 = 59*60+59*2 = 3540+118 = 3658 驗算: 3658/62 = 59 24. 37*46 = 37*40+37*6 = 1480+222 = 1702 驗算: 1702/46 = 37 |
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