What great timing number detective, we’ve found a new puzzle and we need your help.

Can you work out which number comes next in this sequence?

**2, 3, 5, 7, __**

The missing number is **11**.

This is a sequence of **prime numbers** and 11 is the next prime number after 7.

**Prime numbers** are numbers that can only be divided by 1 and themselves.

What type of special numbers make the following sequence and which number would come next?

**1, 4, 9, 16, ___**

The numbers in this sequence are **square numbers** and the next square number is 25, which is 5 x 5 or 5².

**Square numbers** are the answers once you have multiplied a number by itself, such as:

1²= 1 x 1 = 1

2² = 2 x 2 = 4

3² = 3 x 3 = 9

4² = 4 x 4 = 16

5² = 5 x 5 = 25

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.

It is now your mission to identify the missing numbers in sequences like the ones that we have just looked at.

Make sure you look out for **prime numbers**, **square numbers** and **triangle numbers**.

Pssstt!! Here’s a handy hint to help you reach superstar status:

Write down the relationship between the numbers as you go, it will make it easier to spot a pattern.

Good luck number detective!

We are **counting** on you...