If 21 divides into M then all the factors of 21 must divide into M.
The factors of 21 are 1, 3, 7, 21 (we usually avoid the factor 1 and the number)
So, 3 and 7 must divide into M.
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441 divides evenly by these numbers: 1 3 7 9 21 49 63 147 and 441.
It is 7.
The number 7 and 21 have a common factor of 7. This means that 7 is a divisor of both 7 and 21. In mathematical terms, 7 is a factor of both numbers, as it divides each of them without leaving a remainder.
21. 63 = 32 x 7 84 = 22 x 3 x 7 hcf = 3 x 7 = 21
Positive 29.... -21 + 29 = 8