1/3 x 21 = 7
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3/21 + 7/21 = 10/21
The factors of 6 are 1, 2, 3, and 6. The factors of 21 are 1, 3, 7, and 21. The common factors of 6 and 21 are 1 and 3, and the GCF is 3.
It is: 21/63 = 1/3
The numbers that go into 21 evenly are 1, 3, 7, 21.
1 minus 11/21 = 10/21