36
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Approximately 15.87
252 = 4*7*9 Sqrt(252) = 6*Sqrt(7), or 6*(7).5
The highest common factor of the numbers 294, 252 and 210 is 42.
1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 252
You multiply 126 x 2 = 252