What are number line jumps?

Each problem, like 7 + 4, comes with a number line. Children start at the green dot, draw one jump for each one they add or take away, and write where they land.

Which ranges are there?

0 to 10, up to 20, and tens up to 100.

Are answer keys included?

Yes. The key draws the jumps and the answer.

Number Line Worksheets: Missing Numbers and Addition Jumps to 20 and 100

Seeing addition and subtraction

A number line shows adding as moving forward and taking away as moving back. It is the bridge from counting objects to mental maths.

In the MOE curriculum

Primary 1Adding and subtracting within 100, including adding or taking away tens mentally.
Primary 2Counting in tens and hundreds, and comparing and ordering numbers up to 1000.
Primary 4Rounding to the nearest 10, 100 or 1000, where a number line shows which ten is closer.

The syllabus does not list the number line as a topic, but it is one of the representations Singapore teachers use to connect counting with calculation. In Primary 1 it suits the mental strategies the syllabus names, such as adding tens to a 2-digit number: 34 + 20 is two jumps of ten.

Number lines also connect to measurement. A ruler is a number line, and the P1 length topic asks children to measure to the nearest centimetre.

Summarised in our own words from the MOE Primary Mathematics Syllabus (Primary One to Six, 2021, updated October 2025).