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Question
Circle the correct subtraction fact (by using casting out nine).
6732 – 4361 = 2371
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Solution
6732 – 4361 = 2371
6732 – 4361 = 2371
9 – 5 = 13
4 = 4
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What if someone gives you to add ten numbers together?
Did you notice some pattern in the answers?
Take the first two odd numbers. Now add them, see what you get. Now, at every step, add the next odd number.|
How far can you go on?
