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

Starter quiz

What number is halfway between 0 and 100?

20

40

50 ✓

70
What number is halfway between 100 and 200?

'150' ✓
What number is represented by the arrow?

205

250 ✓

270

350
What number is represented by the arrow?

'750' ✓
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?

'240' ✓
What number is represented by the arrow?

'785' ✓

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

'450' ✓
The arrow shows the position of a number. Which number?

50

150

250 ✓

450
Which of these is the best estimate for the number shown by the arrow on this number line?

90

110

130

170 ✓
Which of these is the best estimate for the number shown by the arrow on this number line?

100

300 ✓

500

700
Which of these is the best estimate for the number shown by the arrow on this number line?

350

550 ✓

750

850
Which arrow represents the position of 125?

a ✓

b

c

d

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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.

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).

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.