Year 5 - Maths
Estimate and multiply a 2-digit by a 1-digit number using expanded and short multiplication
Multiplication by partitioning leading to short multiplication (2 by 1-digit)
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Study Guides
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 multiply a 2-digit number by a single-digit number using partitioning and representations using expanded multiplication and using short multiplication.
Lesson Summary
You will learn to use expanded and short multiplication to multiply 2-digit by 1-digit numbers.
Key Notes
- Use times tables and place value to estimate the product of a 2-digit by a 1-digit multiplication.
- Use expanded short multiplication to multiply a 2-digit by a 1-digit number.
- Use short multiplication to multiply a 2-digit by a 1-digit number.
Vocabulary To Learn
- Estimation: To find a value that is close enough to the right answer, usually with some thought or calculation involved is known as estimation.
Common Mistakes To Avoid
- Pupils may find it difficult to identify the multiples of 10 a number is between when estimating.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Use times tables and place value to estimate the product of a 2-digit by a 1-digit multiplication. Use expanded short multiplication to multiply a 2-digit by a 1-digit number.
2. Use this key word in a maths sentence and explain it clearly. 'Estimation'
To find a value that is close enough to the right answer, usually with some thought or calculation involved is known as estimation. 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 find it difficult to identify the multiples of 10 a number is between when estimating. Correction: Provide a number line and continue to use stem sentences to support pupils in their thinking.
More Lessons In This Unit
- Multiply a 2-digit number by a 1-digit number using expanded multiplication (no regroups) Study Guide
- Multiply a 2-digit number by a 1-digit number using expanded multiplication (regrouping 10s to 100s) Study Guide
- Multiply a 2-digit number by a 1-digit number using expanded multiplication (regrouping 1s to 10s) Study Guide
- Multiply a 2-digit number by a 1-digit number using partitioning Study Guide
- Multiply a 2-digit number by a 1-digit number using partitioning and representations (one regroup) Study Guide
- Multiply a 2-digit number by a 1-digit number using partitioning and representations (two regroups) Study Guide
- Multiply a 2-digit number by a 1-digit number using short multiplication (no regroups) Study Guide
- Multiply a 2-digit number by a 1-digit number using short multiplication (regrouping 10s to 100s) Study Guide
- Multiply a 2-digit number by a 1-digit number using short multiplication (regrouping 1s to 10s) Study Guide
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