New
New
Year 1

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

I can explain that the digits in the numbers 11 to 19 express position on a number line.

New
New
Year 1

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

I can explain that the digits in the numbers 11 to 19 express position on a number line.

Lesson details

Key learning points

  1. The numbers 11 - 19 can be positioned on a number line.
  2. Saying the teen numbers as one ten and __ ones helps you to position them on a number line.
  3. There is a link with the position of the numbers 1 - 9 on a number line and the numbers 11 - 29.
  4. 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.

Practical creation of a number line can be a useful experience for pupils in this lesson as opposed to viewing or drawing. Use large number cards and a washing line or similar to encourage estimation, placement and reasoning using understanding of teen numbers.
Teacher tip

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).

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6 Questions

Q1.
How many apples are shown here?
An image in a quiz
Correct Answer: 13, thirteen
Q2.
What number comes next in the count? 6, 7, 8, 9, 10,
Correct Answer: 11, eleven
Q3.
What number is missing in this sequence? 10, 11, 12, , 14
Correct Answer: 13
Q4.
Which number is in the middle of this number line?
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4
Correct answer: 5
6
Q5.
Look at the number line. If 10 is the whole and 6 is a part, what is the missing part?
An image in a quiz
Correct Answer: 4, four
Q6.
Which place value chart represents the apples?
An image in a quiz
An image in a quiz
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz

6 Questions

Q1.
What number is missing in this sequence?
An image in a quiz
Correct Answer: 17, seventeen
Q2.
What number is missing in this sequence?
An image in a quiz
Correct Answer: 13, thirteen
Q3.
What number is the midpoint on this number line?
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14
Correct answer: 15
16
Q4.
What number is the arrow pointing to on this number line?
An image in a quiz
Correct Answer: 11
Q5.
What number is the arrow pointing to on this number line?
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13
14
15
Correct answer: 16
Q6.
Estimate the number shown by the arrow on this number line.
An image in a quiz
20
Correct answer: 19
18