Year 3 - Maths
Represent a 3-digit number up to 199 in different ways
Bridging 100: counting on and back in 10s, adding/subtracting multiples of 10
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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 find pairs of number that compose 100. They will position 3-digit numbers on a number line and estimate their position on unmarked number lines. They will compare and order 3-digit numbers.
Lesson Summary
You will learn to represent a 3-digit number up to 199.
Key Notes
- Numbers can be written as digits.
- Numbers can label a set of objects.
- Numbers can label a position on a number line or scale.
Vocabulary To Learn
- Representing: Showing something, or standing for something.
- 3-digit number: Represents a number of hundreds, tens and ones.
- Place value: The value of a digit in a number based on where it is placed.
Common Mistakes To Avoid
- Pupils may misread numbers when using number lines (e.g. read 105 as 95).
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Numbers can be written as digits. Numbers can label a set of objects.
2. Use this key word in a maths sentence and explain it clearly. 'Representing'
Showing something, or standing for something. 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 misread numbers when using number lines (e.g. read 105 as 95). Correction: Encourage children to say the 10s number before and after (e.g. the number is in between 100 and 110).
More Lessons In This Unit
Browse all guides in the Year 3 Maths guide library.