Survey about child emotional intelligence
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Sep 27, 2012
Exactly what facts are included. Here's why I'm asking:
Addition basic facts include addends 1-10. The answers are basic facts sums. Each addend is equal to or less then 10. Each sum is equal to or less than 20.
If you reverse these, you get basic subtraction facts.But there are other subtraction facts that do not meet the reverse-addition theory.
For example: 20 - 1 = 19. Seems like a basic subtraction fact. But 19 + 1 is not a basic addition fact.
Another example: 17 - 5 = 12. Seems like it should be a basic fact. But 12 + 5 = 17 is not a basic addition fact.
So my question: Are all facts under 20 fair game, or only reverse addition?
Thanks in advance for your opinions on this.
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