11 to 19
Here is part of a number square, look at the coloured numbers, what do you notice?
Each number has two digits. Can you see a pattern?
The numbers get bigger by one from left to right.
Watch: Numbers greater than 9
Example 1
Which numbers are missing from this number line?
1 of 2
Example 2
Which numbers are missing from this number line? What is different about this number line?
1 of 2
Example 3
Here are some socks.
- 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.
Showing 15
Here are 15 base ten blocks.
Here are the same 15 base ten blocks arranged as 1 ten (a stick of ten) and 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.
Here are two more ways of representing 15 using a ten frame and a bead string.
Can you think of any more ways to show 15?
Activity 1
Look at these three pictures. Which number is shown by each picture?
Answers
a) 11
b)12
c) 19
Activity 2
Order the numbers from smallest at the top, to largest at the bottom.
Activity 3
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!
More on Counting and ordering
Find out more by working through a topic
- count11 of 20
- count12 of 20
- count13 of 20
- count14 of 20