3 and 7 are factors for 21. And conversely 21 is a multiple of both 7 and 3. So if you count by 7s you will reach 21. You can also reach 21 if you count by 3s.
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5th Grade Resources by Kavitha Komatineni(2008-2009) |
"A Great Resource for 5th Grade Math, Science, Reading"
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