21 - (10 x 2) = 1
10 - (1 x 10) = 0
For the values: 10 and 21
The LCM is: 1
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2 |10,18 , |_________ 5,9 The GCF of 10 and 18 is 2.
3/21 + 7/21 = 10/21
15 5,3 10 5,2 The common factors are 1 and 5.
The prime factorization of 10 is 2 x 5. You need another number to find a GCF or LCM.