Why are there 60 minutes in an hour, and not 10? Why do we count up to 10, anyway? Quentin, age five, wants to know.

You can count in 10s using a number line. This number line starts at 0 and ends at 90. The numbers go up in units of 10. Let's use this number line to count in 10s to work out how many pencils ...

In this Maths article, learn how to count to 10 with this Year 1 article from BBC Bitesize Primary Maths.