教學指標 (10)

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