This activity is about finding common multiples of numbers within a given range.

__Example__

Write down two numbers between 20 and 40 that are multiples of __both__ **3** and **4**.

**Answer**

The multiples of **3** are 3, 6, 9, 12, 15, 18, 21, **24**, 27, 30, 33, **36**, 39... etc.

The multiples of **4** are 4, 8, 12, 16, 20, **24**, 28, 32, **36**, 40, 44, 48, 52... etc.

The common multiples are the ones that appear in both lists and are shown in red.

The ones in the range between 20 and 40 are **24 **and** 36**.

You might have seen that 12 was a common multiple of 3 and 4, but, the question asked us to find common multiples between 20 and 40.

Remember, when we see the phrase... 'w*rite down two numbers between 20 and 40' ... *this means that neither of these numbers can be our answer.

**Between**means numbers that can be found within these two points.

So for example here, we know our answer will come from the following number range 21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39, as these are the numbers **between 20 **and **40**.