Published at Friday, 06 September 2019. addition worksheet. By Chanelle Herve.
He moves one counter from the group of 4 to the group of 9. Now, he can immediately see that 9 + 4 is equivalent to 10 + 3, so 9 + 4 must equal 13.
This leads to solving problems more slowly, making more mistakes, and an overall lack of confidence in math.
+9 facts (purple)
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