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How to count to 100

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.

Example 1

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

Example 2

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

Activity 1

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?

Activity 2

Try this quiz to test your knowledge.