小二甲 蘇家榆 數補p26 01/19/97 星期六 天氣:晴 心情:高興 1. 18-3 = 15 15-3 = 12 12-3 = 9 9-3 = 6 6-3 = 3 3-3 = 0 答:需要 6 個盒子才能全部裝完。 18/3 = 6 答:需要 6 個盒子才能全部裝完。 2. 42-6 = 36 36-6 = 30 30-6 = 24 24-6 = 18 18-6 = 12 12-6 = 6 6-6 = 0 答:可分成 7 組。 42/6 = 7 答:可分成 7 組。 3. 35-5 = 30 30-5 = 25 25-5 = 20 20-5 = 15 15-5 = 10 10-5 = 5 5-5 = 0 答:可以裝成 7 盒。 35/5 = 7 答:可以裝成 7 盒。 4. 49-7 = 42 42-7 = 35 35-7 = 28 28-7 = 21 21-7 = 14 14-7 = 7 7-7 = 0 答:可裝成 7 包。 49/7 = 7 答:可裝成 7 包。 5. 42-7 = 35 35-7 = 28 28-7 = 21 21-7 = 14 14-7 = 7 7-7 = 0 答:可以買 6 枝自動鉛筆。 42/7 = 6 答:可以買 6 枝自動鉛筆。 6. 7*9 = 63 答:63 7. 7*6 = 42 答42 8. 計算題: (1) 75+24 = 75+20+4 = 99 75+24 = 99 驗算: 99-24 = 99-20-4 = 75 (2)95-91 = 95-90-1 = 4 95-91 = 4 驗算: 4+91 = 4+90+1 = 95 (3)47+21 = 47+20+1 = 68 47+21 = 68 驗算: 68-21 = 68-20-1 = 47 (4)85-75 = 85-70-5 = 10 85-75 = 10 驗算: 10+75 = 10+70+5 = 85 (5) 68-32 = 68-30-2 = 36 68-32 = 36 驗算: 36+32 = 36+30+2 = 68 (6) 69+30 = 99 69+30 = 99 驗算: 99-30 = 69 (7) 66+34 = 66+30+4 = 100 66+34 = 100 驗算: 100-34 = 100-30-4 = 66 (8) 57+13 = 57+10+3 = 70 57+13 = 70 驗算:70-13 = 70-10-3 = 57 (9)47+36 = 47+30+3+3 = 83 47+36 = 83 驗算: 83-36 = 83-30-3-3 = 47 (10) 28+63 = 28+60+3 = 91 28+63 = 91 驗算: 91-63 = 91-60-1-2 = 28 (11) 38+66 = 38+60+2+4 = 104 38+66 = 104 驗算: 104-66 = 104-60-4-2 = 38 (12) 79+21 = 79+20+1 = 100 79+21 = 100 驗算:100-21 = 100-20-1 = 79 (13) 59+34 = 59+30+1+3 = 93 59+34 = 93 驗算: 93-34 = 93-30-3-1 = 59 (14) 19+67 = 19+60+1+6 = 86 19+67 = 86 驗算: 86-67 = 86-60-6-1 = 19 |
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