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Year 1 - Maths

Using known addition and subtraction facts

Solving problems in a range of contexts

Unit Summary

In this unit pupils have the opportunity to apply their knowledge of counting, comparing and number facts to solve problems in a range of contexts.

Lesson Summary

You will learn to use known addition and subtraction facts within 10 when solving problems.

Key Notes

  • In order to solve a problem, we must visualise and represent it. Once we can see a problem, we know what to calculate.
  • We can represent a problem in many different ways, including as bar models, 'First, Then, Now' models and equations.
  • To calculate a solution, we can use a range of strategies.
  • We can use our knowledge of addition facts to help us solve subtraction facts.
  • We can use our knowledge of subtraction facts to help us solve addition facts.

Vocabulary To Learn

  • Represent: Showing something or standing for something.
  • Calculate: To work out an answer.
  • Efficient: Not wasting time or effort. An efficient strategy is one we can carry out easily.
  • Strategy: A plan or method to achieve a specific goal.

Common Mistakes To Avoid

  • Children may recall a fact incorrectly, deploying the wrong strategy to calculate.

3 Quick Questions (With Answers)

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

In order to solve a problem, we must visualise and represent it. Once we can see a problem, we know what to calculate. We can represent a problem in many different ways, including as bar models, 'First, Then, Now' models and equations.

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

Showing something or standing for something. 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 recall a fact incorrectly, deploying the wrong strategy to calculate. Correction: Revisit strategies for calculating within 10 including using knowledge of doubling, near-doubles, odd and even numbers and one more and one less. Spend time practising recall of these facts beyond the lesson.

More Lessons In This Unit

Browse all guides in the Year 1 Maths guide library.