Number Lines to 1000
Year 3 students use number lines that extend to 1000 to understand the order and relative size of three-digit numbers.
What You Need to Know
Key Concept Diagram
A number line to 1000 can be marked in intervals of 100, 50, or 10
Placing a number on a number line shows its position relative to other numbers
Halfway points between hundreds help estimate the position of numbers
Number lines support addition and subtraction by counting forward or back
Key Vocabulary
Number line
A straight line with numbers placed at equal intervals
Interval
The equal gap between each mark on a number line
Halfway
The point exactly in the middle between two numbers
Three-digit number
A number with hundreds, tens and ones, from 100 to 999
Knowledge Check
Select the correct answer for each question. Click "Check Answer" to see if you are right.
Question 1
On a number line from 0 to 1000, where would 500 be placed?
Question 2
Which number is halfway between 600 and 700?
Question 3
On a 0–1000 number line marked in 100s, between which two marks does 830 sit?
Key Concepts Summary
- ●A number line to 1000 can be marked in intervals of 100, 50, or 10
- ●Placing a number on a number line shows its position relative to other numbers
- ●Halfway points between hundreds help estimate the position of numbers
- ●Number lines support addition and subtraction by counting forward or back