Question

Whats the LCM of 4,5 and 10 ?

Answer 1

20

Explanation:

LCM means the lowest common multiple. In other words, you need to find the first common multiple of 4,5 and 10 ie the first number that you find can be divisible by 4,5 and 10 with no remainders.

So all you have to do is to write out the multiples of 4,5 and 10

multiples of 4: 4, 8, 12, 16, `color (red)(20)`, 24, 28, 32, 36, 40
multiples of 5: 5, 10, 15, `color (red) (20)`, 25, 30, 35, 40, 45, 50
multiples of 10: 10, `color (red)(20)`, 30, 40, 50, 60, 70, 80, 90, 100

By comparing all the multiples of 4,5 and 10, you will notice that the number 20 is the first number that can be found

Therefore, the LCM of 4,5 and 10 is 20.

Answer 2

`20` is the LCM

Explanation:

In finding the LCM (Lowest Common Multiple) of `4,5 and 10`, you do not need to consider `5` at all because `10` is a multiple of `5`.

Think through the multiples of `10` (the bigger number) until you find the first which is divisible by `4`

`10, color(blue)(20), 30, 40 ....`
`" "uarr`

`20` is the LCM