Year 3 - Maths
Use known facts to find pairs of numbers that total 100
Securing place value to 100 and applying to addition and subtraction
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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 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 known facts to find pairs of numbers that total 100.
Key Notes
- Number facts to 10 can be applied to multiples of 10
- If 3 plus 2 is equal to 5 then 3 tens plus 2 tens is equal to 5 tens.
- When you add a single digit to a multiple of ten, only the ones digit changes.
Vocabulary To Learn
- Total: A total is the result of adding.
- 2-digit number: A 2-digit number refers to a value between 10 and 99. The number is made up of two digits which represent tens and ones.
Common Mistakes To Avoid
- Pupils lack fluency in pairs for 10 and so struggle to connect this to 2-digit numbers.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Number facts to 10 can be applied to multiples of 10. If 3 plus 2 is equal to 5 then 3 tens plus 2 tens is equal to 5 tens.
2. Use this key word in a maths sentence and explain it clearly. 'Total'
A total is the result of adding. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils lack fluency in pairs for 10 and so struggle to connect this to 2-digit numbers. Correction: Promote fluency through games and chants and consider providing a scaffold of pairs for 10 for pupils to use which automaticity develops.
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 place value knowledge to write addition and subtraction equations Study Guide
Browse all guides in the Year 3 Maths guide library.