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Here is a number grid from 1 to 100.

Look at the highlighted numbers. What do you notice?

Here are the numbers:

10, 20, 30, 40, 50, 60, 70, 80, 90, 100

Each number is 10 more than the one before.

Let's use counting in tens to find the answers to some questions.

Here is a pile of 10 books.

Can you count in tens to find how many books there are in 4 piles?

Let's count them:

10, 20, 30, 40

You can see that there are 40 books in 4 piles of 10.

You can also write this as a repeated addition.

10 + 10 + 10 + 10 = 40

A box of pencils holds 10 pencils.

Can you count in tens to work out how many there are in total?

Let's count them:

10, 20, 30, 40, 50, 60, 70

Through repeated addition this is:

10 + 10 + 10 + 10 + 10 + 10 + 10 = 70

Practise counting up in tens from 0 to 100.

Remember that the last digit is always 0 when counting in 10s.

Now, have a look at these four pictures showing groups of 10s. Can you count in 10s to work out how many objects there are in each picture?

Try this quiz to test your knowledge.