Year 1 - Maths
Explain that numbers can represent how many objects there are in a set
Composition of numbers 0 to 5
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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 revisit how numbers are represented cardinally and ordinally. They will partition 1 - 5 in different ways, find a missing part when one part and the whole are known and explore one more and one less with numbers to five.
Lesson Summary
You will learn to recognise how many objects there are in a small set without counting them.
Key Notes
- Counting rhymes help to link the name with the numeral, the cardinal value and the position in the linear number system.
- Numbers can represent how many objects there are in a set.
- For small sets, we can subitise to identify quantity instead of counting.
Vocabulary To Learn
- Count: To say the number words in order, the last number tells how many there are in the whole set.
- Subitise: Instantly recognising the number of objects in a small group, without counting.
Common Mistakes To Avoid
- Children may rely on counting all and may not count accurately when given unfamiliar arrangements.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Counting rhymes help to link the name with the numeral, the cardinal value and the position in the linear number system. Numbers can represent how many objects there are in a set.
2. Use this key word in a maths sentence and explain it clearly. 'Count'
To say the number words in order, the last number tells how many there are in the whole set. 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 rely on counting all and may not count accurately when given unfamiliar arrangements. Correction: Children need to build familiarity with different arrangements of number. Comment on what you notice eg. 'I can see 3 and 1, I can see 4'.
More Lessons In This Unit
- Find a missing part when one part and the whole is known Study Guide
- Ordinal numbers show the position of an object in relation to another Study Guide
- Partition numbers one to five in different ways Study Guide
- Partition the numbers one to five in a systematic way Study Guide
- Show one more and one less than a number using representations Study Guide
- Show one more and one less than a number using representations and describe this accurately Study Guide
- Solve problems finding a missing part when one part and the whole is known Study Guide
- Solve problems using a bar model to represent a whole partitioned into two parts Study Guide
- Use a bar model to represent a whole partitioned into two parts Study Guide
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