Year 3 - Maths
Use place value knowledge to write addition and subtraction equations
Securing place value to 100 and applying to addition and subtraction
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Study Guides
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 known facts to find multiples of ten that compose 100 and use known facts to find complements to 100. They will add and subtract multiples of ten, bridging 100.
Lesson Summary
You will learn to use place value knowledge to write addition and subtraction equations.
Key Notes
- The language of unitising helps us to use number facts to add and subtract multiples of 10.
- The language of unitising helps us to use number facts to add and subtract multiples of 100.
- Place value equipment supports explanation of the addition and subtraction equations.
Vocabulary To Learn
- Part: A piece or section of the whole.
- Whole: All of a group or number.
- Bar model: A way to represent a problem involving parts and whole.
Common Mistakes To Avoid
- Identifying the parts and wholes in a problem or given context.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
The language of unitising helps us to use number facts to add and subtract multiples of 10. The language of unitising helps us to use number facts to add and subtract multiples of 100.
2. Use this key word in a maths sentence and explain it clearly. 'Part'
A piece or section of the whole. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Identifying the parts and wholes in a problem or given context. Correction: Use the stem sentences and representations of part-part-whole and bar models to support pupils in identifying the parts and whole.
More Lessons In This Unit
- Bridge 100 by adding in multiples of 10 Study Guide
- Bridge 100 by subtracting in multiples of 10 Study Guide
- Composition of 100 in 10s and 1s Study Guide
- Composition of 100 in 50s, 25s and 20s Study Guide
- Multiples of 10 that total 100 Study Guide
- Represent 3-digit multiples of 10 in different ways Study Guide
- Solve problems using knowledge of addition and subtraction of multiples of 10 Study Guide
- Use known facts to find complements to 100 efficiently Study Guide
- Use known facts to find pairs of numbers that total 100 Study Guide
Browse all guides in the Year 3 Maths guide library.