Explain that the digits in the numbers 11 to 19 express position on a number line | Maths

Starter quiz

How many apples are shown here?

'13' ✓
What number comes next in the count? 6, 7, 8, 9, 10, ______

'11' ✓
What number is missing in this sequence? 10, 11, 12, ______, 14

'13' ✓
Which number is in the middle of this number line?

4

5 ✓

6
Look at the number line. If 10 is the whole and 6 is a part, what is the missing part?

'4' ✓
Which place value chart represents the apples?

Exit quiz

What number is missing in this sequence?

'17' ✓
What number is missing in this sequence?

'13' ✓
What number is the midpoint on this number line?

14

15 ✓

16
What number is the arrow pointing to on this number line?

'11' ✓
What number is the arrow pointing to on this number line?

13

14

15

16 ✓
Estimate the number shown by the arrow on this number line.

20

19 ✓

18

Worksheet

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Presentation

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Video

Lesson Details

Key learning points

The numbers 11 - 19 can be positioned on a number line.
Saying the teen numbers as one ten and __ ones helps you to position them on a number line.
There is a link with the position of the numbers 1 - 9 on a number line and the numbers 11 - 29.
Knowing one more and one less than a number to 20 can help to estimate the position the teen numbers on a number line.

Common misconception

Pupils do not space numbers equally or consistently on a number line.

Show pupils examples of number lines both horizontal and vertical and draw attention to the gaps between numbers. Talk to children about the equal size 'jumps' between them to support understanding.

Keywords

One more - One more than is when there is a greater amount by one or another item in the set.
One less - One less than is when there is a smaller value by one.
Estimate - To find a value that is close enough to the right answer, usually with some careful thought involved.