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Mental Maths

Mental Maths. Strategies. Mental maths is a process which involves calculating an exact answer in your head. It is important that children are taught a variety of strategies which can be applied to solve calculations mentally.

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Mental Maths

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  1. Mental Maths

  2. Strategies • Mental maths is a process which involves calculating an exact answer in your head. • It is important that children are taught a variety of strategies which can be applied to solve calculations mentally. • Through the development and increase in confidence of applying strategies which have been taught pupils will feel more equipped for solving problems and calculations mentally.

  3. How did you do it? • Use the whiteboards and pens provided to calculate the answer to this question mentally. Write your answer on the whiteboard. 46+29

  4. Strategies that we use in Class 2 We use a variety of strategies in Class 2 which children are introduced to from EARLY level. The main ones which can be applied to all calculations involving the 4 operation are: • Partitioning (ability to split a number) • Rounding and Adjusting • Looking for complements

  5. Looking for Complements • Pupils develop the ability to recognise and recall complements of larger numbers. They use their knowledge of complements to 10 to help them do this as they know 6+4=10 • They then extend this to complements of 100 e.g. 60 + 40 =100. • And again for complements to 1000 e.g. 600+400=1000. • Pupils are encouraged to use their knowledge of complements to recognise patterns which can help them solve calculations.

  6. Have a Go! • Use what you already know about 3 X 4 to help you calculate 30 X 4. • How did you solve it?

  7. What is Partitioning? • Partitioning is the ability to split a number to make a calculation more manageable to complete mentally. • We can use partitioning to solve 76 X 4. 70 4 4

  8. Have a Go! • Use what you know about partitioning to help you solve these: 24 X 6 136 + 242

  9. Rounding and Adjusting • This is a very useful strategy for pupils to learn and apply to help them solve mental calculations. • For example to solve 237 + 48 • Round 48 to 50 and add it to 237 to give 287 then because you have rounded a number up by 2 you must take the 2 back off to give 285. +50 - 2 237 287 285

  10. Rounding and Adjusting for Multiplication • To solve 78 X 6 you can use rounding and adjusting. 78 X 6 =(80 X 6) – (2 X 6) = 480 – 12 = 468

  11. Try These • 36 X 8 • 346 + 73 • 367 X 4 Explain what strategy you used to the people at your table.

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