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Year 1 - Maths

Calculate amounts up to 20 p

Unitising and coin recognition - value of a set of coins

Unit Summary

In this unit pupils will use knowledge of the value of coins and apply their number facts and counting skills to calculate the total value of the coins in a set of 2p 5p 10p coins. 

Lesson Summary

You will learn to calculate amounts within 20 p.

Key Notes

  • Coins can be added in any order, but it is more efficient to group coins of the same value together.
  • It is more efficient to add the greatest value coins first, or find coins that will help with using a mental strategy.
  • When adding coins, known strategies can be used to help add efficiently.
  • A number line can be used to help keep track of the coins added.

Vocabulary To Learn

  • Efficiently: Not wasting time or effort. An efficient strategy is one we can carry out easily.

Common Mistakes To Avoid

  • Children may start counting with the first coin they see or arranged them in a line in no particular order, leading to inefficient counting strategies instead of more efficient calculation methods.

3 Quick Questions (With Answers)

1. Solve this in steps: explain the method from this lesson and why each step matters.

Coins can be added in any order, but it is more efficient to group coins of the same value together. It is more efficient to add the greatest value coins first, or find coins that will help with using a mental strategy.

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

Not wasting time or effort. An efficient strategy is one we can carry out easily. Use this word when showing your method, then check your final answer is reasonable.

3. Spot and fix this common maths mistake.

Mistake: Children may start counting with the first coin they see or arranged them in a line in no particular order, leading to inefficient counting strategies instead of more efficient calculation methods. Correction: Encourage children to group coins of the same value together and start with higher value coins, so they can apply the calculation strategies they already know to find the total value of a set of different coins.

More Lessons In This Unit

Browse all guides in the Year 1 Maths guide library.