It is 7.
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Well honey, the largest whole number that will divide evenly into 21, 42, and 63 is 21. Why? Because 21 is a common factor of all three numbers. So, if you're looking for the big daddy of divisors, look no further than good ol' 21.
7
21. 63 = 32 x 7 84 = 22 x 3 x 7 hcf = 3 x 7 = 21
21% is a fraction between 0 and 1. It cannot be converted to a whole number.
A whole number is a number that has no fractions or decimal places attached to it. 21 is a whole number. 3.75 is not.