1,3,7,21
42 prime factors -----> 2,3,7 105 prime factors -----> 3,5,7 There is 3 and 7 in common : There fore 3*7 = 21; 21 is the greatest common factor.
The factors of 2 are 1, and 2
The factors of 21 are: 1,3,7, and 21.
168.
1,2,5,10
Th LCM of 21 and 42 is: 42
The factors of 21 are 1,3,7, and 21. The factors of 70 are 1,2,5,7,14,35, and 70.
The factors of 21 are 1, 3, 7, and 21
Every number has factors. They are endless.
The factors of 21 are 1,3,7, and 21. The factors of 70 are 1,2,5,7,14,35, and 70 The common factors of 21 and 70 are 1 and 7.
The GCF is 1.
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