The HCF of both numbers is 1
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The largest number that can be divided by both 18 and 45 is 9. 18 divided by 9 is 2 and 45 divided by 9 is 5.
The common factors of 63 and 49 are 1 and 7.
It can, of course, be divided by 1 and 49. It can also be divided by 7.
1.2857
7