Year 1 - Maths
Identify the quantity shown in a representation of numbers 11 to 19
Composition of numbers 11 to 19
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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 explain 11-19 as cardinal and ordinal numbers. They will double and halve numbers 6-9 and use addition and subtraction facts to add and subtract within 20.
Lesson Summary
You will learn to identify the quantity shown in a representation of numbers 11 to 19.
Key Notes
- The numbers 11-19 can be formed by combining a ten and ones.
- The numbers 11-19 can be partitioned into a ten and ones.
- Tens frames can be used to represent the numbers 11 to 19
Vocabulary To Learn
- Partition: Splitting an object or value into smaller parts.
- Tens: A ten is a group of 10 ones.
- Ones: Individual objects, grouped in ones.
Common Mistakes To Avoid
- Pupils use one to one correspondence to count all rather than counting on from a group of 10 to identify a teen number.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
The numbers 11-19 can be formed by combining a ten and ones. The numbers 11-19 can be partitioned into a ten and ones.
2. Use this key word in a maths sentence and explain it clearly. 'Partition'
Splitting an object or value into smaller parts. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils use one to one correspondence to count all rather than counting on from a group of 10 to identify a teen number. Correction: Provide concrete and pictorial examples where it is more difficult to count the ones in a group of 10 e.g. a bundle of straws or box of pencils. Encourage pupils to use the phrase 'one ten and ...' to focus attention on counting on from 10.
More Lessons In This Unit
- Double the numbers 6 to 9 and halve the result explaining what doubling and halving is Study Guide
- Explain that the digits in the numbers 11 to 19 express position on a number line Study Guide
- Explain that the digits in the numbers 11 to 19 express quantity Study Guide
- Explore odd and even numbers within 20 Study Guide
- Solve subtraction problems using knowledge of 10 and a bit Study Guide
- Use knowledge of 10 and a bit to solve problems Study Guide
- Use knowledge of addition and subtraction facts within 10 to add and subtract within 20 Study Guide
- Use knowledge of addition facts within 10 to add within 20 Study Guide
- Use knowledge of subtraction facts within 10 to subtract within 20 Study Guide
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