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回覆 王家爸爸 的帖子
Agreed. Important to learn the concept. So, I will use within 10 to teach. 10-x =7, x+3=5Also use real life example or sentences. e.g. 5-x=2. A car has 5 seats. A group of people gets in. There are 2 seats left. How many ppl in that group.
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