The highest common factor of the numbers 294, 252 and 210 is 42.
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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
36
42, 84, 126, 168, 210, 252, 294, 336, 378, 420, 462, 504, 546, . . .
1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 252
You multiply 126 x 2 = 252