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.

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...

## Lesson details

### Key learning points

1. Knowing where multiples of 100 are placed on an unmarked number line supports in positioning 3-digit numbers accurately.
2. Marking halfway steps helps to estimate the positions of numbers.
3. 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).

## Starter quiz

### 6 Questions

Q1.
What number is halfway between 0 and 100?
20
40
70
Q2.
What number is halfway between 100 and 200?
Correct Answer: 150, one hundred and fifty
Q3.
What number is represented by the arrow?
205
270
350
Q4.
What number is represented by the arrow?
Correct Answer: 750, seven hundred and fifty
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?
Correct Answer: 240, two hundred and forty
Q6.
What number is represented by the arrow?

## Exit quiz

### 6 Questions

Q1.
The arrow shows the position of a number. Which number?
Correct Answer: 450, four hundred and fifty
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?