The highest common multiple is an infinite number and a bit impractical.
In this case, the GCF is 7 and the LCM is 147.
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The GCF of 21, 49 and 115 is 1.
The factors of 21 and 1,3,7, and 21Now since 21 is not a factor of 49, but 7 is we can say right away the GCF is 7.
1, 3, 7, 21 1, 7, 49
32
The factors of 35 are: 1, 5, 7, 35 The factors of 49 are: 1, 7, 49