New

New

Year 3

# Estimate the position of 3-digit numbers on unmarked number lines

I can estimate the position of 3-digit numbers on an unmarked number line.

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New

New

Year 3

# Estimate the position of 3-digit numbers on unmarked number lines

I can estimate the position of 3-digit numbers on an unmarked number line.

Share activities with pupils

Share function coming soon...

## Slide deck

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## Lesson details

### Key learning points

- Knowing where multiples of 100 are placed on an unmarked number line supports in positioning 3-digit numbers accurately.
- Marking halfway steps helps to estimate the positions of numbers.
- Counting in steps of 1, 10 and 100 helps us to position a number on a number line.

### Common misconception

Pupils may struggle with positioning numbers on 0-1,000 lines.

Relate the positioning of numbers on 0-100 number lines with 0-1,000 number lines (e.g. 19 and 190, 37 and 370).

### Keywords

Estimate - Estimate means finding a value that is close to the answer.

Position - Position means where something is located.

Unmarked - Unmarked means that many of the steps on a number line are not given.

Encourage pupils to find the halfway points on unmarked number lines, using the start and end numbers. For example, on a 200-400 number line, mark the steps that show 300, then find 250 and 350.

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).

## Video

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## Worksheet

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## Starter quiz

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### 6 Questions

Q1.

What number is halfway between 0 and 100?

20

40

70

Q2.

What number is halfway between 100 and 200?

Q3.

What number is represented by the arrow?

205

270

350

Q4.

What number is represented by the arrow?

Q5.

Sofia is thinking of a 10s number that could be represented on the number line. The digits of the number add up to 6. What is the number?

Q6.

What number is represented by the arrow?

## Exit quiz

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### 6 Questions

Q1.

The arrow shows the position of a number. Which number?

Q2.

The arrow shows the position of a number. Which number?

50

150

450

Q3.

Which of these is the best estimate for the number shown by the arrow on this number line?

90

110

130

Q4.

Which of these is the best estimate for the number shown by the arrow on this number line?

100

500

700

Q5.

Which of these is the best estimate for the number shown by the arrow on this number line?

350

750

850

Q6.

Which arrow represents the position of 125?

b

c

d