Question

Write the first common multiple of $4$ and $5$.

Answer 1

Write the multiples of $4$ and $5$ and circle the common multiples.

Multiples of $4$ are: $4,8,12,16,\overline{)20},24,28,32,36,\overline{)40}$.

Multiples of $5$ are: $5,10,15,\overline{)20},25,30,35,\overline{)40},45,50$.

Hence, $\overline{)20}$ is the first common multiple of $4$ and $5$.