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Calculations in mathematics

Calculations in mathematics. Things are different now!. addition. Year 3 Partitioning method is used – for example 37 + 24 = 61 30 + 20 = 50 7 + 4 = 11. Year 4 Partitioning used for increasingly large numbers –eg 2417 + 3524 = 5941 2000 + 3000 = 5000 400 + 500 = 900

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Calculations in mathematics

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  1. Calculations in mathematics Things are different now!

  2. addition • Year 3 Partitioning method is used – for example 37 + 24 = 61 30 + 20 = 50 7 + 4 = 11

  3. Year 4 Partitioning used for increasingly large numbers –eg 2417 + 3524 = 5941 2000 + 3000 = 5000 400 + 500 = 900 10 + 20 = 30 7 + 4 = 11 Year 4 continued Vertical layout introduced – eg 47+ 368+ 76493 110 700 13 150 123 11 861 Addition

  4. Addition • Year 5 & Year 6 As for year 4 but extended to include decimals with partitioning – eg 7.6 + 5.8 = 13.4 7 + 5 = 12 0.6 + 0.8 = 1.4

  5. Addition • Y6 More able children introduced to compact and efficient method at the appropriate time – eg 1 7 9 + 2 1 . 7 + 21 31 62 21 . 5 4 1 54 4 . 2

  6. Subtraction • Year 3 Empty number line method is used – eg 95 - 33 = 62 7 50 5 33______________________________95 40 90

  7. Years 4 – 6 The empty number line continues to be used in these year groups. The children are encouraged to develop increasingly refined and efficient methods of using the number line. Subtraction

  8. Subtraction • Year 6 Compact and efficient method introduced at appropriate time for more able children – eg 6 6 4 7 16 – 5 7 . 12 - 1 3 93 4 . 5 3 3 7 2 2 . 7

  9. Multiplication • Year 3 Arrays are used to develop understanding. Children begin to use partitioning – eg 16 x 5 = 80 10 x 5 = 50 6 x 5 = 30

  10. Multiplication • Year 4 Children continue to partition but grid method is introduced – eg 6 x 32 = 192 X 30 2 6 180 12

  11. Multiplication • Years 5 & 6 Grid method used with larger numbers and decimals – eg 27 x 15 = 4051.23 x 45 = 55.35 X 20 7 X 1 0.2 0.03 10 200 70 = 270 40 40 8 1.249.2 5 100 35 = 135 5 5 1 0.15 6.15 405 55.35

  12. Multiplication • More compact method for grid introduced where appropriate: 26 x 37 20 x 30 = 600 20 x 7 = 140 6 x 30 = 180 6 x 7 = 42 962

  13. Multiplication • Y6 Compact and efficient method introduced when appropriate for more able children – eg 3 2 x 2 4 x 4 . 8 x 1 62 22 3 1 9 2 4 8 14 . 4 41 8 0 5 2 8

  14. Division • Year 3 and 4 Chunking method used along with visual model including remainders – eg 16 ÷ 4 = 436 ÷ 10 = 3 Rem 6 ….. . . . . . . . . . …. . . . . . . . . . . ….. . . . . . . . . . …. . . . . . .

  15. Division • Years 4, 5 & 6 These methods can also be used with a number line – eg 120 ÷ 9 = 13 rem 3 0____________________________90_____117__120 10x9 3x9

  16. Year 4, 5 & 6 The concept of chunking is still used but method becomes numerical rather than pictorial. Several strategies are used, all of which rely on good knowledge of times tables! 2. 265 ÷ 13 = 20 rem 5 13 265 130 (10 x 13) 135 - 130 (10 x 13) 5 Division 93 ÷ 6 = 15 rem 3 (16.5) I know that 10 x 6 = 60 and 5 x 6 = 30 so 15 x 6 = 90

  17. Useful websites www.supermathsworld.com Outer space-related activities on wide range of topics – annoying music though! www.educationcity.com Log-in: 815western Password: school Go to ‘Curriculum Map’ Maths Choose year group then specific maths area www.bbc.co.uk/schoolradio/maths/mathschallenge.shtml Download radio programmes containing a variety of mental maths questions www.subtangent.com More able children – investigative challenges nrich.maths.org/public Go to ‘Stage 1 and 2’ down left-hand side for the latest mathematical challenges, graded by difficulty with stars. woodlands-junior.kent.sch.uk/maths Allsorts of interactive activities. Well indexed.

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