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

Starter quiz

What number comes next in the count? 6, 7, 8, 9 ______.

'10' ✓
What number is missing in this sequence? 6, 7, 8, 9, 10, ______, 12

'11' ✓
How many apples are there?

'6' ✓
How many oranges are there?

10

9 ✓

8
Jun and Sofia are counting the pencils. Who is correct?

Sofia says, "I think there are fewer than 10 pencils." ✓

Jun says, "I think there are more than 10 pencils."
How many pencils are there?

'7' ✓

Exit quiz

Which of these statements about teen numbers is correct?

The teen numbers come between 0 and 10

The teen numbers come between 10 and 20 ✓

The teen numbers come between 20 and 30
How many apples are shown here?

'11' ✓
How many pencils are shown here?

'14' ✓
Which numeral represents a teen number?

11 ✓

15 ✓

17 ✓

51
Which place value chart represents the oranges?
Which place value chart represents the pencils?

Worksheet

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Presentation

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Video

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.

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.

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.