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Mastering Subtraction Bonds with Dr. Fog - Year 3

Engage students in mental tasks and investigations to improve subtraction skills with this interactive resource. Enhance vocabulary, problem-solving, and number fluency. Get ready to excel in subtraction! Get it now with Dr. Fog.

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Mastering Subtraction Bonds with Dr. Fog - Year 3

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  1. Instant recall of Subtraction Bonds Dr Fog Presents Year 3 (National Numeracy Strategy) (Based on DFEE Sample Lessons) www.DrFog.co.uk

  2. Resources • Sets of 0 – 20 Number Cards or Number Fans. • Two 1-20 dice • Individual Number Lines (Optional)

  3. Mental Learning Objective • I can use and spell subtraction vocabulary.

  4. Mental Learning Task • Today we are going to think about words about subtraction.

  5. Mental Learning Task • What words do you know about subtraction? • Write them on the board.

  6. Mental Learning Task • Can anyone use these words to make number sentences?

  7. Mental Learning Task • In pairs write down a number sentence using any of the words or phrases on the board. • Read out you examples to the class.

  8. Mental Learning Objective • I can use and spell subtraction vocabulary.

  9. Main Learning Objective • I can find the difference between two numbers under 21. • I can investigate problems involving differences.

  10. Key idea I can generalise and I can check my generalisations.

  11. Main Learning Task • By the end of the year you should know all of your addition and subtraction facts up to 20 in your head.

  12. Main Learning Task • Today we are going to practise subtractions. • I want you to answer the questions as quickly as you can.

  13. Main Learning Task • Your teacher will roll two 1 – 20 dice and call out the numbers. • Show the difference between these two numbers with your number fans. • Your teacher will keep the pace fast!

  14. Main Learning Task • Today we are going to look at an investigation involving difference. • Look at this grid.

  15. Main Learning Task • Can you give me 4 numbers to write on the grid.

  16. Main Learning Task • Write down the difference between each neighbouring yellow box in the blue box.

  17. Main Learning Task • Put a ring around differences which are odd numbers. • How do we tell if a number is odd or even?

  18. Main Learning Task • Everyone is now to work in pairs. • Children must arrange any four numbers on a similar grid so that the differences are all odd.

  19. Main Learning Task • Simplification:- Suggest the children work with numbers below 10. • Challenges:- Find another solution that works. • Try the same investigation on a 3x3 grid.

  20. Main Learning Objective • I can find the difference between two numbers under 21. • I can investigate problems involving differences.

  21. Plenary • Can a volunteer who has completed the grid come to the board and show their grid. • Has anyone found a different solution? • What general rule is there?

  22. Plenary • Did anyone realise that every odd number needs to be next to an even one? • Lets find some more solutions and see if they fit this rule. • How did you solve the differences?

  23. Plenary • Which pairs did you just know? • Which pairs of numbers were not easy to remember? • Why not? • If you are subtracting 9 from a number, how might you do it? • Is there any other method?

  24. Review of Key Idea • I can generalise and I can check my generalisations. • Did you learn this this lesson?

  25. Where Can I Find More Resources Like This? • You can now visit my teaching resource website at http://www.DrFog.co.uk • You can click here to search for more of my teaching resources. • Click here to visit my TES shop!

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