小二甲 蘇家榆 數補 p31 01/24/97 星期四 天氣：晴 心情：高興 計算題： (1) 45+( ) = 90 ( ) = 90-45 = 90-40-5 = 45 45+45 = 90 驗算： 90-45 = 90-40-5 = 45 (2) 36+( ) = 92 ( ) = 92-36 = 92-30-2-4 = 56 36+56 = 92 驗算： 92-56 = 92-50-2-4 = 36 (3) 27+( ) = 82 ( ) = 82-27 = 82-20-2-5 = 55 27+55 = 82 驗算： 82-55 = 82-50-2-3 = 27 (4) 58+( ) = 80 ( ) = 80-58 = 80-50-8 = 22 58+22 = 80 驗算： 80-22 = 80-20-2 = 58 (5) 18+( ) = 63 ( ) = 63-18 = 63-10-3-5 = 45 18+45 = 63 驗算： 63-45 = 63-40-3-2 = 18 (6) 48+( ) = 76 ( ) = 76-48 = 76-40-6-2 = 28 48+28 = 76 驗算： 76-28 = 76-20-6-2 = 48 (7) 59+( ) = 72 ( ) = 72-59 = 72-50-2-7 = 13 59+13 = 72 驗算： 72-13 = 72-10-2-1 = 59 (8) 39+( ) = 85 ( ) = 85-39 = 85-30-5-4 = 46 39+46 = 85 驗算： 85-46 = 85-40-5-1 = 39 (9) 29+( ) = 68 ( ) = 68-29 = 68-20-8-1 = 39 29+39 = 68 驗算：68-39 = 68-30-8-1 = 29 (10) 20-( ) = 8 ( ) = 20-8 = 12 20-12 = 8 驗算：8+12 = 8+10+2 = 20 (11) 30-( ) = 15 ( ) = 30-15 = 30-10-5 = 15 30-15 = 15 驗算： 15+15 = 15+10+5 = 30 (12) 40-( ) = 22 ( ) = 40-22 = 40-20-2 = 18 40-18 = 22 驗算： 22+18 = 22+10+8 = 40 (13) 51-( ) = 18 ( ) = 51-18 = 51-10-1-7 = 33 51-33 = 18 驗算：18+33 = 18+30+2+1 = 51 (14) 61-( ) = 15 ( ) = 61-15 = 61-10-1-4 = 46 61-46 = 15 驗算： 15+46 = 15+40+5+1 = 61 (15) 71-( ) = 32 ( ) = 71-32 = 71-30-1-1 = 39 71-39 = 32 驗算： 32+39 = 32+30+8+1 = 71 (16) 82-( ) = 47 ( ) = 82-47 = 82-40-2-5 = 35 82-35 = 47 驗算： 47+35 = 47+30+3+2 = 82 (17) 92-( ) = 54 ( ) = 92-54 = 92-50-2-2 = 38 92-38 = 54 驗算： 54+38 = 54+30+6+2 = 92 (18) 73-( ) = 38 ( ) = 73-38 = 73-30-3-5 = 35 73-35 = 38 驗算： 38+35 = 38+30+2+3 = 73 (19) 63-( ) = 25 ( ) = 63-25 = 63-20-3-2 = 38 63-38 = 25 驗算： 25+38 = 25+30+5+3 = 63 (20) 84-( ) = 38 ( ) = 84-38 = 84-30-4-4 = 46 84-46 = 38 驗算： 38+46 = 38+40+2+4 = 84 (21) 74-( ) = 35 ( ) = 74-35 = 74-30-4-1 = 39 74-39 = 35 驗算： 35+39 = 35+30+5+4 = 74 (22) 65-( ) = 27 ( ) = 65-27 = 65-20-5-3 = 38 65-38 = 27 驗算： 27+38 = 27+30+3+5 = 65 (23) 86-( ) = 18 ( ) = 86-18 = 86-10-6-2 = 68 86-68 = 18 驗算：18+68 = 18+60+2+6 = 86 |
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