105
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Oh honey, the Highest Common Factor of 15 and 21 is 3. It's like finding the common ground between two divas - you gotta go with the biggest number that can divide them both without any drama. So, in this case, 3 is the lucky winner.
The smallest number into which both 7 and 15 can be divided evenly is 105.
The number is 120.
120
9 and 15 both go into 45. Example: 9,18,27,36,45 15,30,45