Year 5 - Maths
Compare and order numbers with up to 3 decimal places
Use knowledge of decimals to solve problems in different contexts: length
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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 use their knowledge of decimal place value to convert between and compare metres and centimetres explaining that different lengths can be composed additively and multiplicatively.
Lesson Summary
You will learn to use understanding of place value to compare and order numbers with up to 3 decimal places.
Key Notes
- To compare two numbers, you compare digits with the same place value, starting with the largest place-value digit
- If whole numbers. tenths and hundredths are the same, look at the value of the thousandths digit to compare and order
Vocabulary To Learn
- Compare: When you compare, you look for similarities and differences in an object or value.
- Place value: The value of a digit in a number based on where it is placed is known as place value.
- Order: You can order numbers by putting them in a place based on a set rule.
Common Mistakes To Avoid
- Pupils mistake numbers with more digits after the decimal point to be the larger number.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
To compare two numbers, you compare digits with the same place value, starting with the largest place-value digit. If whole numbers. tenths and hundredths are the same, look at the value of the thousandths digit to compare and order.
2. Use this key word in a maths sentence and explain it clearly. 'Compare'
When you compare, you look for similarities and differences in an object or value. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils mistake numbers with more digits after the decimal point to be the larger number. Correction: Provide opportunities for pupils to build numbers with base 10 blocks, enabling them to see the magnitude of the numbers they compare.
More Lessons In This Unit
- Explain that different lengths can be composed additively and multiplicatively Study Guide
- Read and write numbers with up to 3 decimal places Study Guide
- Round a decimal number with hundredths to the nearest tenth Study Guide
- Round a decimal number with hundredths to the nearest whole number Study Guide
- Solve problems with numbers with up to 3 decimal places Study Guide
- Use knowledge of column addition and subtraction to calculate with decimals: tenths and hundredths Study Guide
- Use knowledge of decimal place value to convert between and compare metres and centimetres Study Guide
- Use knowledge of decimal place value to solve problems in different contexts Study Guide
- Use knowledge of place value to calculate with decimal numbers up to and bridging one tenth Study Guide
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