Year 1 - Maths
Explore odd and even numbers within 20
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 explore odd and even numbers within 20.
Key Notes
- Recall odd and even numbers to ten.
- A number is even if the ones digit is even.
- An even number can be made from groups of two.
- A number is odd if the ones digit is odd.
- An odd number cannot be made from groups of two.
Vocabulary To Learn
- Odd: Any number that cannot be made of pairs. The last digit is 1, 3, 5, 7 or 9
- Even: Any number that can be made of pairs. The last digit is 0, 2, 4, 6 or 8
- Pair: Two together. Often with something in common.
Common Mistakes To Avoid
- Children may think a number is an odd number if the tens digit is odd.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Recall odd and even numbers to ten. A number is even if the ones digit is even.
2. Use this key word in a maths sentence and explain it clearly. 'Odd'
Any number that cannot be made of pairs. The last digit is 1, 3, 5, 7 or 9. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Children may think a number is an odd number if the tens digit is odd. Correction: Reinforce the tens number being even by showing the groups of 2 We only need to look at the ones digit to see if a number is odd or even.
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
- 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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