Year 5 - Maths
Use representations to round a decimal number with tenths to the nearest whole number
Compose and calculate with decimals including column addition and subtraction
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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 extend their understanding of formal calculation strategies to use column methods to add and subtract with decimal numbers.
Lesson Summary
You will learn to use representations to round a decimal number with tenths to the nearest whole number.
Key Notes
- Identify the next and previous whole numbers to the number being rounded.
- Identify which whole number is nearest to the number being rounded.
- If the value of the tenths is 5 or greater then round to the next whole number.
- If the value of the tenths is less than 5, round to the previous whole number.
Vocabulary To Learn
- Multiple: A multiple is the result of multiplying a number by an integer. For example 2 × 5 = 10 so 10 is a multiple of 2 and 5.
- Next: Something that comes after something else.
- Previous: Something that comes before something else.
- Rounding: Rounding means making a number simpler but keeping its value close to what it was.
Common Mistakes To Avoid
- Pupils say the previous multiple of one as a whole before e.g. previous multiple of 3.4 as 2 or 2.4
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Identify the next and previous whole numbers to the number being rounded. Identify which whole number is nearest to the number being rounded.
2. Use this key word in a maths sentence and explain it clearly. 'Multiple'
A multiple is the result of multiplying a number by an integer. For example 2 × 5 = 10 so 10 is a multiple of 2 and 5. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils say the previous multiple of one as a whole before e.g. previous multiple of 3.4 as 2 or 2.4. Correction: Place the number on a number line and clarify the whole numbers it sits between.
More Lessons In This Unit
- Explain that decimal numbers with tenths can be composed additively Study Guide
- Explain that decimal numbers with tenths can be composed multiplicatively Study Guide
- Use knowledge of column addition and subtraction to calculate with decimal numbers Study Guide
- Use known facts and mental strategies to calculate with decimal numbers within and across a whole Study Guide
Browse all guides in the Year 5 Maths guide library.