The factors of 21 are: 1, 3, 7, 21
The factors of 35 are: 1, 5, 7, 35
Factors of 21 are 3 and 7 (21=3x7). Factors of 35 are 5 and 7 (35=5x7). Factors of 49 are 7 and 7 (49=7x7).
Factors of 21: 1, 3, 7, and 21.Factors of 35: 1, 5, 7, and 35.You didn't ask for the factors that are common to 21 and 35.If you had asked for those, the answer would have been: 1 and 7 .
The numbers that go into both 21 and 35 are their common factors. The factors of 21 are 1, 3, 7, and 21, while the factors of 35 are 1, 5, 7, and 35. The only common factor between them is 7. Thus, 7 is the greatest common divisor of 21 and 35.
735
3 is a factor of 21, so ignore it. 21 factors to [3 7] 35 factors to [5 7] common factor [7] LCM = 21 * 35 / 7 = 105 ■
The factors of 21 are:1, 3, 7, 21The factors of 35 are:1, 5, 7, 35The common factors are:1, 7
The common factors are: 1, 7
The common factors are: 1, 7
The factors of 21 are: 1, 3, 7, 21The factors of 35 are: 1, 5, 7, 35The common factors are: 1, 7
15: 1,3,5,15 28: 1,2,4,7,14,28 21: 1,3,7,21 35: 1,5,7,35
-14 and -21
1 and 7