Question

Why are `60 and 120` common multiples of `10 and 12?`

Answer 1

Put simply, `120` and `60` are divisible by both `10` and `12`.

`120/10 = 12`; `120/12 = 10`; `60/10 = 6`; `60/12 = 5`.

Answer 2

Some numbers are common multiples of smaller numbers.

Explanation:

Write down the multiples of both `10 and 12`:

`10: rarr" " 10,20,30,40,50,color(blue)(60),70,80,90,100,110,color(blue)(120),130,...`

`12: rarr" "12,24,36,48,color(blue)(60),72,84,96,108,color(blue)(120),132,144...`