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11 to 19

Here is part of a number square, look at the coloured numbers, what do you notice?

a numberline with numbers 11 to 19 shaded

Each number has two digits. Can you see a pattern?

The numbers get bigger by one from left to right.

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Watch: Numbers greater than 9

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Example 1

Which numbers are missing from this number line?

Image gallerySkip image gallerySlide 1 of 2, A number line with a gap between 13 and 15. Then another gap between 16 and 18. , Click to reveal the answer.
An illustration of a young boy thinking.
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Example 2

Which numbers are missing from this number line? What is different about this number line?

Image gallerySkip image gallerySlide 1 of 2, a number line showing a gap between 18 and 16. Then another gap between 16 and 14, Click to reveal the answer.
An illustration of a young girl pointing upwards with her left hand.
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Example 3

Here are some socks.

13 socks. 3 have flowers on them
  • How many socks have flowers on them?

There are 3 socks with flowers on them.

  • How many socks do not have flowers on them?

There are 10 socks which do not have flowers on them.

  • How many socks are there altogether?

There are 13 socks altogether.

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Showing 15

Here are 15 base ten blocks.

15 ones

Here are the same 15 base ten blocks arranged as 1 ten (a stick of ten) and 5 ones.

1 ten 5 ones

1 ten and 5 ones makes 15.

10 + 5 = 15

15 can also be shown like this using a part whole model. It is split into 1 ten and 5 ones.

15 shown as 10 and 5

Here are two more ways of representing 15 using a ten frame and a bead string.

15 represented with a ten frame and bead strings.

Can you think of any more ways to show 15?

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Activity 1

Look at these three pictures. Which number is shown by each picture?

11 socks, 12 blocks, 19 made of 1 ten and 9 ones

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Activity 2

Order the numbers from smallest at the top, to largest at the bottom.

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Activity 3

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NEW! Play Karate Cats Maths - the winter update. game

Deck the dojo in the Christmas update and unlock festive outfits for your Karate Cats. Available for a limited time only!

NEW! Play Karate Cats Maths - the winter update
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More on Counting and ordering

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