Year 1 - Maths
Explain that the digits in the numbers 11 to 19 express position on a number line
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 explain that the digits in the numbers 11 to 19 express position on a number line.
Key Notes
- The numbers 11 - 19 can be positioned on a number line.
- Saying the teen numbers as one ten and __ ones helps you to position them on a number line.
- There is a link with the position of the numbers 1 - 9 on a number line and the numbers 11 - 29.
- Knowing one more and one less than a number to 20 can help to estimate the position the teen numbers on a number line.
Vocabulary To Learn
- One more: One more than is when there is a greater amount by one or another item in the set.
- One less: One less than is when there is a smaller value by one.
- Estimate: To find a value that is close enough to the right answer, usually with some careful thought involved.
Common Mistakes To Avoid
- Pupils do not space numbers equally or consistently on a number line.
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 positioned on a number line. Saying the teen numbers as one ten and __ ones helps you to position them on a number line.
2. Use this key word in a maths sentence and explain it clearly. 'One more'
One more than is when there is a greater amount by one or another item in the set. 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 space numbers equally or consistently on a number line. Correction: Show pupils examples of number lines both horizontal and vertical and draw attention to the gaps between numbers. Talk to children about the equal size 'jumps' between them to support understanding.
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 quantity Study Guide
- Explore odd and even numbers within 20 Study Guide
- Identify the quantity shown in a representation of numbers 11 to 19 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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