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Learning about maths in Year 3

Learning about maths in Year 3. Place value Addition, subtraction Multiplication & division. Autumn term 2010. Place Value. Understanding the value of numbers. How Many?. Hundreds. Tens. Ones. 100. 10. 4. 114. 100 + 10 + 4=. How Many?. Hundreds. Tens. Ones. 300. 30.

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Learning about maths in Year 3

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  1. Learning about maths in Year 3 • Place value • Addition, subtraction • Multiplication & division Autumn term 2010

  2. Place Value Understanding the value of numbers.

  3. How Many? Hundreds Tens Ones 100 10 4 114 100 + 10 + 4=

  4. How Many? Hundreds Tens Ones 300 30 300 + 30= 330

  5. Thousands Tens Ones Hundreds 1000 200 40 3 1000 + 200 + 40 + 3= 1,243

  6. Thousands Tens Ones Hundreds 2000 300 20 5 2000 + 300 + 20 + 5= 2,325

  7. Mental Maths Activity We are going to practise adding numbers to 20. Try this calculation. + 7 9

  8. 9 10 11 12 13 14 15 16 9 + 7 We can do this by counting on. We have counted on 7.

  9. What strategies would you use to add 2 two-digit numbers quickly? • This is one way to do it. • Split (partition) the tens. • Split (partition) the units. • Count on.

  10. 64 + 32 = 96 Split the tens. Split the units. 60 + 30 + 4 + 2 = 96 Count on. 60 + 30 = 90 4 + 2 = 6 90 + 6 = 96

  11. Practise subtraction facts to 20. subtraction take away

  12. Work out the answer before the question disappears.

  13. 19-10 15 - 6 18 minus 9 5 less than 12 16 subtract 8

  14. Subtractions using number lines. Top Tip! Don’t forget to count on to the nearest multiple of 10.

  15. 36 – 24 = 12 6 6 24 30 36 Where shall we jump to first? Now we can jump to 36. How many have we counted on altogether? 6 + 6 = 12

  16. 19 45 – 26 = 4 10 5 30 40 26 45 Where shall we jump to first? Now where shall we jump? How many from 40 to 45? 4 + 10 + 5 = 19

  17. 45 – 19 = Can you think of a quick way to do this? 19 is near to 20. 45 – 20 = 25 25 + 1 =26

  18. Year 3 Derive and recall multiplication facts for the 2, 3, 4, 5, 6 and 10 times-tables and the corresponding division facts. Year 4 Derive and recall multiplication facts up to 10 × 10, the corresponding division facts. Year  5 Recall quickly multiplication facts up to 10 x 10 and derive quickly corresponding division facts. Year 6 Use knowledge of place value and multiplication facts to 10 × 10 to derive related multiplication and division facts involving decimals (e.g. 0.8 × 7, 4.8 ÷ 6). Use knowledge of multiplication facts to derive quickly squares of numbers to 12×12. Learning times tables www.teachingtables.co.uk

  19. Division Understanding division as sharing and grouping. To know what to do with remainders. 15 3 = ? We can solve this by jumping along a number line.

  20. 15 3 = 0 3 We jump along in 3s – we use our 3 times tables.

  21. 15 3 = 0 3 6

  22. 15 3 = 0 3 6 9

  23. 15 3 = 0 3 6 9 12

  24. 15 3 = 0 3 6 9 12 15

  25. 15 3 = 0 3 6 9 12 15 How many jumps have you made?

  26. How many jumps have you made? 5 0 3 6 9 12 15 So 15 3 = 5

  27. What about 17  4? 0 4

  28. 0 4 8

  29. 0 4 8 12

  30. 0 4 8 12 16

  31. + 1 0 4 8 12 16 17

  32. + 1 0 4 8 12 16 17 So 17  4 = 4r1

  33. Try to solve these real life problems using the method we have just used. David Beckham has 24 trophies. He puts 4 on every shelf. How many shelves can he fill?

  34. What about 24  4? 0 4

  35. What about 24  4? 0 4 8

  36. What about 24  4? 0 4 8 12

  37. What about 24  4? 0 4 8 12 16

  38. What about 24  4? 0 4 8 12 16 20

  39. 0 4 8 12 16 20 24 24  4 = 6 Beckham would need 6 shelves for his trophies.

  40. http://www.st-john.leicester.sch.uk/ Learning about maths in Year 3 1st Tonight’s power point saved here 2nd

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