Use a number line
- Mark the endpoints.
- Count equal intervals.
- Read the position carefully.
Answer: Halfway between 10 and 20 is 15
🔢 Number
Number lines
Learn number lines with a GCSE-style explanation, help guide, worked example, practice question and flashcards.
Global XP
Level 10 / 100 XP
1. Explanation
Key idea
- Number lines is part of number and appears often in KS3–GCSE maths.
- Number lines show numbers in order and help compare distances.
- Use the worked model, help guide, interactive question and flashcards to practise number lines until the steps feel automatic.
Real-life examples
- Shopping, sport, travel, science, design and everyday decisions all use this skill.
2. Visual
Number lines learning map
Understand the key idea → follow the help guide → practise a question → check your method → build speed with flashcards.
3. Help guide
How to tackle Number lines
- Learn the rule: Number lines show numbers in order and help compare distances.
- Worked model: Mark the endpoints. Count equal intervals. Read the position carefully.
- Try the interactive question without looking at the answer first.
- Use the flashcards to test the rule, the method and a common check.
4. Worked examples
Step-by-step working
5. Interactive questions
Try it yourself
What number is halfway between -2 and 6?
6. Flashcards
Master quick recall
Flip each card, then choose whether you know it or need more practice.
0 mastered
FrontRule for Number lines
BackNumber lines show numbers in order and help compare distances.
FrontExample answer: What number is halfway between -2 and 6?
Back(-2 + 6) ÷ 2 = 4 ÷ 2 = 2.
FrontCommon check for Number lines
BackCheck units/notation, compare with an estimate, and make sure the answer matches the question.
7. Finish
Complete this topic
When you have read the examples, tried the question and reviewed flashcards, claim your topic completion XP.