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HCF EXAMPLE

The factors of 15 are : 1, 3, 5, 15.

1 and 3 are the only common factors (numbers which are factors of

Therefore, the highest common factor of 12 and 15 is 3.

LCM Example Consider the numbers 12 and 15 again:

The multiples of 12 are : 12, 24, 36, 48, 60, 72, 84, ....

The multiples of 15 are : 15, 30, 45, 60, 75, 90, ....

60 is a common multiple (a multiple of

Therefore, the lowest common multiple of 12 and 15 is 60.