My son is in second grade and had a math sheet for homework tonight. There is one question that has thrown me for a loop, sad, I know

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Anyway, there was a 100s chart in which he was to follow these directions:

1. Finish coloring the skip counts by 10s. (So he colored the row of #s you would say when counting by 10s.)

2. Circle skip counts by 3s. (He started at 3 and circled the #s said when counting by 3s.)

3. What patterns do you see with skip counts by 10s and 3s?

That is the million dollar question. Any ideas would be greatly appreciated

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Thanks!