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The (LCM) Least Common Multiple of 7 and 3 is 21 because that is the LEAST number that both 3 and 7 go into.
8 x 7 = 56, 7 x 3 = 21, so 7
It is: 4 and 3/7 as a mixed number
1, 3, 7, 9, 21, 63
If that's the mixed number 7 and 1/3, the whole number is 7.