The Subtraction Wrap-ups come with 10 keys and cover facts from 1-1 to 22-10 and everything in between. Wrap the string from the problem on the left to the answer on the right. Simply turn it over to see if you got it right.
The Subtraction Wrap-ups come with 10 keys and cover facts from 1-1 to 22-10 and everything in between. Wrap the string from the problem on the left to the answer on the right. Simply turn it over to see if you got it right.
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