盤算數學 ⑽
故事寫算式,算式說故事
個數計算 大 - 小 +1
❶ 0 , 1 , 2
1 + 1 + 1 = 1 ×3 = 3
2 - 0 +1 = 3 大-小 +1
❷ 3,4,5,6,7,8, 1 ×6 = 6
8 - 3 +1 = 6
❸日,一,二,三,四,五,六
0 , 1 , 2 , 3 , 4 , 5 , 6 1 ×7 = 7
6 - 0 +1 = 7
星期日是一週的開始,0是起點
❹1 , 2 , 3 ,,,,,, 123
123 - 1 +1 = 123
❺19 , 20 , 21,,, 91
91 - 19 +1 = 73
前後差 1 即連續整數,
個數計數法 大 - 小 +1
❻123,122,121,,, ☆ 共有66個數
∵ 123 - ☆ +1 = +66
∴ 123 +1 -66 = +☆ = 58
倒數應用,方法相同
加減互逆,算式驗證
Calculate the mathematical ⑽
Story writing,calculating the story
The number of large - small +1
❶ 0, 1, 2
1 + 1 + 1 = 1 × 3 = 3
2 - 0 +1 = 3 big - small +1
❷ 3,4,5,6,7,8, 1 × 6 = 6
8 - 3 +1 = 6
Day, one, two, three, four, five, six
0, 1, 2, 3, 4, 5, 6, 1 ×7 = 7
6 - 0 +1 = 7
Sunday is the beginning of the week, 0 is the starting point
❹1, 2, 3 ,,,,,, 123
123 - 1 +1 = 123
❺19, 20, 21 ,,, 91
91 - 19 +1 = 73
Before and after the difference 1 is a continuous integer,
Count count large - small +1
❻123,122,121 ,,, ☆ There are 66 numbers
∵ 123 - ☆ +1 = +66
∴ 123 +1 -66 = + ☆ = 58
Countdown application, the same method
Addition and subtraction, inverse verification
