1. Both numbers are prime.
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The common factors are: 1, 5, 7, 35
Find the prime factors of each, and multiply groupings of common factors, as well as individual, ungrouped factors, and you have the LCD (least common denominator): 35 = 5 * 7 49 = 7 * 7 LCD = 5 * 7 * 7 = 245 To get the GCF (greatest common factor), multiply groupings of common factors: GCF = 7
1,5,7,35Since 35 is a factor of 70, all of its factors are common.
The factors of 35 are:1, 5, 7, 35The factors of 140 are:1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140The common factors are:1, 5, 7, 35
The common factors of 140 and 210 are: 1, 2, 5, 7, 10, 14, 35, and 70