It is the first multiple that both numbers have in common
7 14 21 28 35 42 49 56 63 70
9 18 27 36 45 54 63 72
Look through the numbers, and you will see that 63 is the least common multiple.
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The least common multiple for 7 and 9 is 63.
The lowest common multiple of 7 and 9 is 63.Here's how to work it out:Multiples of 9 are: 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, ...Multiples of 7 are: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, ...To find the lowest common multiple you look and find the smallest number that is a multiple of both numbers (in your case 7 and 9). So, in this case the lowest multiple they both have in common is 63.637963The Least Common Multiple (LCM) for 7 9 is 63.
The common factors are 1 and 7. (7 = 1 x 7 and 21 = 3 x 7) The only common prime factor is 7, which is also the largest common factor.
The factors of 14 are:1, 2, 7, 14The factors of 63 are:1, 3, 7, 9, 21, 63The common factors are:1, 7
Multiples of 3 are 3, 6, 9 and so on. Multiples of 7 are 7, 14, 21 and so on. The common multiples of 3 and 7 include 21, 42, 63 and so on.