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.

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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).

Video

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6 Questions

Q1.
What number is halfway between 0 and 100?
20
40
Correct answer: 50
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?
An image in a quiz
205
Correct answer: 250
270
350
Q4.
What number is represented by the arrow?
An image in a quiz
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?
An image in a quiz
Correct Answer: 240, two hundred and forty
Q6.
What number is represented by the arrow?
An image in a quiz
Correct Answer: 785

6 Questions

Q1.
The arrow shows the position of a number. Which number?
An image in a quiz
Correct Answer: 450, four hundred and fifty
Q2.
The arrow shows the position of a number. Which number?
An image in a quiz
50
150
Correct answer: 250
450
Q3.
Which of these is the best estimate for the number shown by the arrow on this number line?
An image in a quiz
90
110
130
Correct answer: 170
Q4.
Which of these is the best estimate for the number shown by the arrow on this number line?
An image in a quiz
100
Correct answer: 300
500
700
Q5.
Which of these is the best estimate for the number shown by the arrow on this number line?
An image in a quiz
350
Correct answer: 550
750
850
Q6.
Which arrow represents the position of 125?
An image in a quiz
Correct answer: a
b
c
d