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Marvin find doubles facts, such as 4+4 and 1+1,on the addition table. He colors each sum. What pattern does Marvin make when he colors the sums of the double facts?

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MrEquation
He would notice that the numbers are starting at two and increasing by 2 each time. Also, all the numbers are even.

The pattern is that you are simply counting by 2's.
2, 4, 6, 8, 10, 12, ....