Year 3 - Maths
Count forwards and backwards in multiples of 2, 20, 5, 50 and 25
Representing 3-digit numbers, comparing and positioning on number lines
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
In this unit pupils will use knowledge of place value to represent a 3-digit number in different ways. They will compare and order 3-digit numbers and position on number lines and unmarked number lines.
Lesson Summary
You will learn to count forwards and backwards in 2s, 20s, 5s, 50s and 25s.
Key Notes
- If you can count in 2s, you can count in 20s. The 1s or 10s digit follows the pattern of 2, 4, 6, 8 and 0
- If you can count in 5s, you can count in 50s. The 1s or 10s digit follows the pattern of 5 and 0
- When you count up in 25s, the 10s and 1s digits are always 25, 50, 75 or 0
Vocabulary To Learn
- multiple: A multiple is the result of multiplying a number by another whole number.
- pattern: A pattern is a repeated set of numbers, shapes or objects.
Common Mistakes To Avoid
- Pupils may make mistakes with counting, particularly when crossing a 100s boundary.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
If you can count in 2s, you can count in 20s. The 1s or 10s digit follows the pattern of 2, 4, 6, 8 and 0. If you can count in 5s, you can count in 50s. The 1s or 10s digit follows the pattern of 5 and 0.
2. Use this key word in a maths sentence and explain it clearly. 'multiple'
A multiple is the result of multiplying a number by another whole number. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils may make mistakes with counting, particularly when crossing a 100s boundary. Correction: Encourage pupils to use the pattern to help them count accurately, using this to predict the next number in the count.
More Lessons In This Unit
- Add and subtract to and from a 3-digit number bridging 100 Study Guide
- Comparing and ordering numbers with 1, 2 and 3 digits Study Guide
- Count forwards and backwards within 3-digits Study Guide
- Estimate the position of 3-digit numbers on unmarked number lines Study Guide
- Ordering sets of 3-digit numbers Study Guide
- Partition 3-digit numbers in different ways Study Guide
- Position 3-digit numbers on number lines Study Guide
- Represent a 3-digit number up to 1,000 in different ways Study Guide
- Solve problems by adding and subtracting to or from 3-digit numbers Study Guide
- Solve problems by counting forwards and backwards in multiples of 2, 20, 5, 50 and 25 Study Guide
- Use known facts to add and subtract multiples of 100 within 1000 Study Guide
- Use known facts to add and subtract to and from multiples of 100 Study Guide
- Use known facts to solve problems involving partitioning numbers Study Guide
- Write a 3-digit multiple of 10 as a multiplication equation Study Guide
Browse all guides in the Year 3 Maths guide library.