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Year 1 - Maths

Count efficiently in groups of ten

Unitising and coin recognition - counting in 2s, 5s and 10s

Unit Summary

In this unit pupils will count efficiently in groups of 2 5 10. They will recognise and explain the value of 1p 2p 5p 10p coins and how a single coin can be worth several pennies. 

Lesson Summary

You will learn to count in groups of ten and identify how many groups there are.

Key Notes

  • Objects can be put into groups of 10 to make them easier to count.
  • Groups of 10 can be called tens.
  • It is more efficient to skip count in tens than to count in ones
  • Counting back in tens from the total amount can be used to check that the count was accurate.

Vocabulary To Learn

  • Groups of 10: Groups of ten objects that can be counted in tens.
  • Tens: Another name for the multiples of ten.
  • Decade numbers: These are the multiples of ten which mark the tens boundary where the pattern of counting changes.
  • Altogether: The amount in the whole set or group.
  • Efficiently: Not wasting time or effort. An efficient strategy is one we can carry out easily.

Common Mistakes To Avoid

  • Children may confuse the number of groups with the amount altogether, for example, they may count 4 groups of 10 as 4 not 40 They may also confuse the number of groups with the group size.

3 Quick Questions (With Answers)

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

Objects can be put into groups of 10 to make them easier to count. Groups of 10 can be called tens.

2. Use this key word in a maths sentence and explain it clearly. 'Groups of 10'

Groups of ten objects that can be counted in tens. 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 confuse the number of groups with the amount altogether, for example, they may count 4 groups of 10 as 4 not 40 They may also confuse the number of groups with the group size. Correction: Draw a ring around each group of 10 whilst using the stem sentence to help describe what you are seeing as you identify each group.

More Lessons In This Unit

Browse all guides in the Year 1 Maths guide library.