180 = 2 x 2 x 3 x 3 x 5; 252 = 2 x 2 x 3 x 3 x 7;
Common factors: 2 x 2 x 3 x 3 ie HCF = 36
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The highest common factor of the numbers 294, 252 and 210 is 42.
36
1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 252
The multiples of 36 (which are infinite) are all divisible by 36, including these: 36, 72, 108, 144, 180, 216, 252, 288 . . .
You multiply 126 x 2 = 252