Year 3 - Maths
Composition of 100 in 10s and 1s
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 compose 100 in 10s and 1s.
Key Notes
- There are 10 tens in 100
- There are 100 ones in 100
- 100 can be represented in different ways and in different contexts
Vocabulary To Learn
- Equivalent: When two or more things have the same value.
- Numeral: A symbol or name that stands for a number.
Common Mistakes To Avoid
- Pupils do not identify that ten tens are equal to 100 and cannot decompose 100 in this way.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
There are 10 tens in 100. There are 100 ones in 100.
2. Use this key word in a maths sentence and explain it clearly. 'Equivalent'
When two or more things have the same value. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils do not identify that ten tens are equal to 100 and cannot decompose 100 in this way. Correction: Base ten blocks or a bead string are useful tools to allow pupils to compose and decompose 100 into equal groups of ten.
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 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
- Use place value knowledge to write addition and subtraction equations Study Guide
Browse all guides in the Year 3 Maths guide library.