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1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 252
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36
The highest common factor of the numbers 294, 252 and 210 is 42.
You multiply 126 x 2 = 252
252/7 = 36
252 = 4*7*9 Sqrt(252) = 6*Sqrt(7), or 6*(7).5