Learn the 3-Step Method
1Find the whole numbers either side.
2.7 is bigger than 2 but smaller than 3.
2Split the gap into 10 tenths.
Each small step between 2 and 3 is one tenth (0.1).
3Count along the tenths.
Count 7 steps from 2: that's 2.7.
Worked Example
Mark 0.3, 0.65 and 0.9 on a number line from 0 to 1.
Watch Out! Common Mistakes
Careful! There are 11 marks but only 10 gaps. Each gap is one tenth.
Wrong! 0.65 is less than 0.7. It sits between 0.6 and 0.7, halfway along.
Wrong! 2.10 equals 2.1, near the start. After 2.9 comes 3.0.
⬇ Cheat Sheet
- Find the whole numbers either side of your decimal.
- Split the gap into 10 equal tenths.
- Count along to place the number.
- Hundredths sit between the tenths marks.
📖 Continue Your Journey
Quick summary
- Every decimal has an exact position on the number line.
- Split the gap between whole numbers into 10 tenths and count along.
- Hundredths sit between the tenths marks: 0.65 is halfway from 0.6 to 0.7.
- Further right always means bigger.
Frequently asked questions
How do you place a decimal on a number line?
Find the two whole numbers it sits between, split that gap into ten equal tenths, then count along. For 2.7, go seven tenths of the way from 2 to 3.
Where does 0.65 go on a number line?
Between 0.6 and 0.7, exactly halfway — because 0.65 is 65 hundredths, and 5 hundredths is half a tenth.
Why do number lines help with decimals?
They turn abstract digits into positions children can see, which makes comparing, ordering and rounding decimals far more intuitive.
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