Question

Colour the common multiples of $3$ and $5$.The common multiples from the grid are

• A. $3,9$
• B. $5,10$
• C. $15$
• D. $15,30$

Answer 1

The correct option is C $15$

We know that a multiple of a number is that number multiplied by an integer. Integers are negative as well as positive.

Now, we write the multiples of $3$ and $5$ are as follows:

Multiples of $3$ are $-3,-6,-9,-12,-\mathrm{15.....},3,6,9,12,15,.......$

Multiples of $5$ are $-5,-10,-15,-20,-\mathrm{25.....},5,10,15,20,25,.......$

Now, from the given grid of numbers, the only common multiple of $3$ and $5$ is $15$ because it is divided by both $3$ and $5$.

Hence, the common multiple of $3$ and $5$ is $15$.