Answer:
GCF of 7, 21 and 35 is 7
In listing method
Multiples of 7:
1, 7
Multiples of 21:
1, 3, 7, 21
Multiples of 35:
1, 5, 7, 35
In prime factorization method
7 = 7
21 = 3 × 7
35 = 5 × 7
= 7
LCM of 7, 21, and 35 is 105
In listing method
Multiples of 7:
7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 105, 112, 119
Multiples of 21:
21, 42, 63, 84, 105, 126, 147
Multiples of 35:
35, 70, 105, 140, 175
In prime factorization method
7 = 7
21 = 3 × 7
35 = 5 × 7
= 3 × 5 × 7
= 105
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