Explain that the digits in the numbers 11 to 19 express quantity

I can explain that the digits in the numbers 11 to 19 express quantity.

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Year 1

Explain that the digits in the numbers 11 to 19 express quantity

I can explain that the digits in the numbers 11 to 19 express quantity.

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Share activities with pupils

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Lesson details

Key learning points

The digits in the numbers 11-19 tell us about their value.
The teen numbers are between 10 and 20
The teen numbers can be represented as ten and a bit.
We can say there is one ten and --- ones.

Keywords

Teen numbers - A number made of a ten (a group of 10 ones) and some additional ones.
Tens - A ten is a group of 10 ones.
Ones - Individual objects, grouped in ones.

Common misconception

Pupils confuse e.g. 18 and 80 because they sound similar.

Take time to emphasise the pronunciation of the teen numbers and provide lots of opportunities for pupils to say and repeat the words. You may wish to practise the teen and decade numbers side by side so pupils can hear the difference.

One key aspect in this lesson is the concept of a group of 10 and that a teen number can be partitioned into a ten and some additional ones. Ensure they have lots of practical experience in making and grouping 1 ten using a range of manipulatives.

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Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).