Year 4 - Maths
Explain how many '100s' and '200s', 1,000 is composed of
Column addition and subtraction with 4-digit numbers
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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 consolidate column addition with regrouping and column subtraction with exchanging to solve problems. They will use known facts and strategies to accurately and efficiently calculate and check.
Lesson Summary
You will learn to explain how many '100s' and '200s', 1,000 is composed of.
Key Notes
- There are ten 100s in 1,000
- There are five 200s in 1,000
- Knowing how many 100s and 200s 1,000 is composed of helps to interpret scales and measures.
- Knowing the composition of 1,000 can help to work out the meaning of each division on scales and number lines.
- We can use our knowledge of divisions on a scale to estimate.
Vocabulary To Learn
- Compose: The parts that make up the whole.
- Counting in Multiples: When we count by a number other than 1
- Divisions: Equal divisions can be found on a number line or scale for equal values.
- Estimation: We find a value that is close enough to the right answer, usually with some thought or calculation involved.
Common Mistakes To Avoid
- Pupils unable to connect scale divisions with knowledge of composition of 1,000
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
There are ten 100s in 1,000. There are five 200s in 1,000.
2. Use this key word in a maths sentence and explain it clearly. 'Compose'
The parts that make up the whole. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils unable to connect scale divisions with knowledge of composition of 1,000. Correction: Spend time developing confidence in counting in multiples of 100 and 200 to 1,000 before making explicit links between this and scales and measures. Use 'The whole is 1,000 and we have divided it into ___ parts of ___' when doing this.
More Lessons In This Unit
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