**The following activity is a practice exercise to help you measure your success under timed conditions.**

**If you are unsure of an answer, move on to the next question.**

**You should come back to questions you found difficult at the end if you have time.**

Let’s try one together as a reminder:

Here is a sequence of numbers called** triangle numbers**. Can you work out the pattern?

**1, 3, 6, 10, 15, 21**

In this sequence, the amount added each time is going up by one.

The next number in this sequence would be **28** as we need to add 7 next to 21.

Now it's time to begin this practice exercise.