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Year 5 - Maths

Use estimation to support accurate calculation

Multiplication by partitioning leading to short multiplication (3 by 1-digit)

Unit Summary

In this unit pupils will multiply a 3-digit number by a single-digit number using expanded and short multiplication.

Lesson Summary

You will learn to use estimation to support accurate calculation.

Key Notes

  • Use times tables and place value to estimate the product of a 3-digit by a 1-digit multiplication.
  • Use expanded short multiplication to multiply a 3-digit by a 1-digit number.
  • Use short multiplication to multiply a 3-digit by a 1-digit number.

Vocabulary To Learn

  • Expanded multiplication: A way of recording the steps of a calculation focusing on partitioning one or more factors and showing partial products.
  • Short multiplication: A way of recording using columns to set out and calculate a multiplication.
  • Estimate: To find a value that is close enough to the right answer, usually with some thought or calculation involved.

Common Mistakes To Avoid

  • Pupils attempt to estimate using approximations that do not allow for quick mental calculation.

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 3-digit by a 1-digit multiplication. Use expanded short multiplication to multiply a 3-digit by a 1-digit number.

2. Use this key word in a maths sentence and explain it clearly. 'Expanded multiplication'

A way of recording the steps of a calculation focusing on partitioning one or more factors and showing partial products. Use this word when showing your method, then check your final answer is reasonable.

3. Spot and fix this common maths mistake.

Mistake: Pupils attempt to estimate using approximations that do not allow for quick mental calculation. Correction: Spend time estimating yourself and modelling the simplicity of it. Use estimations regularly to check the magnitude of an answer.

More Lessons In This Unit

Browse all guides in the Year 5 Maths guide library.