7 is the common factor
you would be left with 2 5 and 9
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The factors of 63 are: 1, 3, 7, 9, 21, 63 The factors of 210 are: 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, 210 The common factors are: 1, 3, 7, 21
77-49=28÷2=〔14〕 21+14=35 35+14=49 49+14=63 63+14=77
The common factor of 63 and 71 is and 1.
Its 315
Since 9 is a factor of 63, all of its factors are common.