Year 1 - Maths
One less with manipulatives and counting
Counting, recognising and comparing numbers 0 - 10
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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 review their knowledge from the EYFS of counting in all its forms to and from 10. They will compare and order numbers to 10 practically and will consider the role of zero to represent nothing.
Lesson Summary
You will learn to find one less from a group using manipulatives and counting.
Key Notes
- Secure understanding of one less as the number before.
- Use a variety of manipulatives and the stem sentence to deepen understanding that the number before is one less than .
- Answer questions such as 'What number comes before 5 when counting?'
Vocabulary To Learn
- One less than: One less than is when there is a smaller value by one.
- One fewer than: One fewer than is when there is a smaller quantity by one or one has been removed from the set.
- Number before: When counting, the number before is the one that comes before a given number.
Common Mistakes To Avoid
- Pupils may start counting on the number given and not recognise that the number before is one less.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Secure understanding of one less as the number before. Use a variety of manipulatives and the stem sentence to deepen understanding that the number before is one less than .
2. Use this key word in a maths sentence and explain it clearly. 'One less than'
One less than is when there is a smaller value by one. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils may start counting on the number given and not recognise that the number before is one less. Correction: Model counting back and highlight the number before alongside the manipulatives. Give opportunities for pupils to remove one from a set.
More Lessons In This Unit
- Anything can be counted Study Guide
- Conservation Study Guide
- Counting different groups Study Guide
- Counting forwards and backwards within 10 Study Guide
- Counting objects within ten Study Guide
- Finding the missing numbers Study Guide
- Introducing zero Study Guide
- More than and fewer than Study Guide
- One more with manipulatives and counting Study Guide
- Ordering numbers to 10 Study Guide
- Ordinal numbers Study Guide
- Representing counting songs Study Guide
- Subitising numbers to five Study Guide
- Using numerals Study Guide
Browse all guides in the Year 1 Maths guide library.