美式數學教法有1.facts family 2.releated facts..有人可以告訴我這二種是什麼嗎?同時也請example.....3Q
- DaSaGwaLv 78 年前最佳解答
A fact family is a group of related facts using the same number
For example: by using numbers 3, 7, 11
3+7=11, 7+3=11, 11-3=7, 11-7=3
The above are 4 related facts in the fact family for number 3, 7, 11 for the addition and subtraction facts
Now, let see the fact family for number 3, 8, 24 for the multiplication and division facts
3x8=24, 8x3=24, 24/3=8, 24/8=3
Pay attention to each related fact has 3 same numbers.
By using the related facts (addition, subtraction, multiplication, division) to find the missing factor (number). The concept is very simple, but it gives students different kind of thinking (by grouping and relating) in solving the problem.
If you want to read more about this, please refer to the following sites:參考資料： self