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Adding

Adding. Adding by Partitioning Vertically. 1 5 6. +. 2 3 2. 3 0 0. 1 0 0 + 200. 8 0. 5 0 + 3 0. 8. 6 + 2. 3 8 8. 3. 5. 2. 7. 1. 1. Formal Written Method. Partitioning Vertically. 2 3 7 8. 2 3 7 8. +. 1 1 4 9. +. 1 1 4 9. 3 0 0 0. 4 0 0. 1 1 0. 1 7.

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Adding

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  1. Adding

  2. Adding by Partitioning Vertically 1 5 6 + 2 3 2 3 0 0 1 0 0 + 200 8 0 5 0 + 3 0 8 6 + 2 3 8 8

  3. 3 5 2 7 1 1 Formal Written Method Partitioning Vertically 2 3 7 8 2 3 7 8 + 1 1 4 9 + 1 1 4 9 3 0 0 0 4 0 0 1 1 0 1 7 3 5 2 7

  4. 6 9 2 7 1 1 Formal Written Method Partitioning Vertically 4 5 7 8 4 5 7 8 + 2 3 4 9 + 2 3 4 9 6 0 0 0 8 0 0 1 1 0 1 7 6 9 2 7

  5. 1 0 4 3 6 1 1 1 Formal Written Method Partitioning Vertically 4 6 8 7 4 6 8 7 + 5 7 4 9 + 5 7 4 9 9 0 0 0 1 3 0 0 1 2 0 1 6 1 0 4 3 6

  6. Subtracting

  7. Subtraction by adding on. 502 - 198 = 304 502- 198 +2 +300 +2 2 (to 200) 300 (to 500) 198 200 500 502 2 (to 502) 304

  8. Subtraction by adding on. 613 - 279 = 334 613- 279 +1 +20 +300 +13 1 (to 280) 20 (to 300) 279 280 300 600 613 300 (to 600) 13 (to 613) 334

  9. Subtraction by adding on. 846 - 458 = 388 846- 458 +42 +300 +46 42 (to 500) 300 (to 800) 458 500 800 846 46 (to 846) 388

  10. Subtraction by adding on. 2645 - 898 = 1746 2645- 898 +2 +100 +1000 +645 2 (to 900) 100 (to 1000) 898 900 1000 2000 2645 1000 (to 2000) 645 (to 2645) 1746

  11. Subtraction by adding on. 3567 - 742 = 2825 3567- 742 +58 +200 +2000 +567 58 (to 800) 200 (to 1000) 742 800 1000 3000 3567 2000 (to 3000) 567 (to 3567) 2825

  12. Subtraction by adding on. 5 2 5 2 1 1 1 3879 - 1352 = 2525 3879- 1352 +48 +600 +1000 +879 48 (to 1400) 600 (to 2000) 1352 1400 2000 3000 3879 1000 (to 3000) 879 (to 3879)

  13. Subtraction by adding on. 8 8 9 3 6457 - 2469 = 3988 6457- 2469 +31 +500 +3000 +457 31 (to 2500) 500 (to 3000) 2469 2500 3000 6000 6457 3000 (to 6000) 457 (to 6457)

  14. Subtraction by adding on. 5021 - 1989 = 3032 +1 +10 +1000 +1000 +1000 +20 +1 1989 1990 2000 3000 4000 5000 5020 5021 Th H T U 3000 30 2

  15. Subtraction by adding on vertically 6008- 2997 3 (3000) 3000 (6000) 8 (6008) 3011

  16. Subtraction by adding on vertically 5003- 1989 11 (2000) 3000 (5000) 3 (6008) 3014

  17. 3 5 6 3 1 5 2 3 9- 1 5 6 7 3 (1570) 3 0 (1600) 4 0 0 (2000) 3 2 3 9 (5239)

  18. 2 7 6 3 4 1 1 1 5 2 3 9- 1 5 6 7

  19. Adding Decimals

  20. 1 0 . 4 7 1 Formal Written Method Partitioning Vertically 6 5 . 4 + 3 9 . 3 6 5 . 4 + 3 9 . 3 . 7 1 4 . 0 9 0 . 0 1 0 4 . 7

  21. 5 . 8 0 1 1 Formal Written Method Partitioning Vertically 2 8 . 7 + 3 9 . 3 2 8 . 7 + 3 9 . 3 1 . 0 1 7 . 0 5 0 . 0 6 8 . 0

  22. 7 . 6 5 1 1 Formal Written Method Partitioning Vertically 2 8 . 7 + 4 7 . 8 2 8 . 7 + 4 7 . 8 1 . 5 1 5 . 0 6 0 . 0 7 6 . 5

  23. 3 0 1 1 0 1 3 2 2 1 Formal Written Method Partitioning Vertically 2 8 . 7 2 8 . 7 4 7 . 8 4 7 . 8 + 5 3 . 6 + 5 3 . 6 2 . 1 . 1 8 . 0 1 1 0 . 0 . 1

  24. Adding by Partitioning Vertically 3.12 + 2.32 .04 .40 5.00 5.44

  25. 7 . 7 7 1 Formal Written Method Partitioning Vertically 5 . 9 1 + 1 . 8 6 5 . 9 1 + 1 . 8 6 . 0 7 1 . 7 0 6 . 0 0 7 . 7 7

  26. Partitioning Vertically 1 0 . 2 8 1 2 Formal Written Method 3 . 8 9 4 . 3 7 3 . 8 9 + 2 . 5 6 4 . 3 7 . 2 2 + 2 . 5 6 1 . 6 0 9 . 0 0 1 0 . 8 2

  27. Subtracting Decimals

  28. Decimals 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

  29. Subtraction by adding on. 24.3 - 7.9 = 16.4 24.3- 7.9 +0.1 +2.0 +10.0 +4.3 0.1 (to 8.0) 2.0 (to 10.0) 7.9 8.0 10.0 20.0 24.3 10.0 (to 20.0) 4.3 (to 24.3) 1 6 .4

  30. Subtraction by adding on. .1 8 2 1 36.8 - 8.7 = 28.1 36.8 - 8.7 +0.3 +1.0 +20.0 +6.8 0.3 (to 9.0) 1.0 (to 10.0) 8.7 9.0 10.0 30.0 36.8 20.0 (to 30.0) 6.8 (to 36.8)

  31. Subtraction by adding on. .5 3 2 1 42.8 - 19.3 = 23.5 42.8 - 19.3 +0.7 +10.0 +10.0 +2.8 0.7 (to 20.0) 10.0 (to 30.0) 19.3 20.0 30.0 40.0 42.8 10.0 (to 40.0) 2.8 (to 42.8)

  32. Subtraction by adding on. 3 .3 3 1 1 56.9 - 23.6 = 33.3 56.9 - 23.6 +0.4 +6.0 +20.0 +6.9 0.4 (to 24.0) 6.0 (to 30.0) 23.6 24.0 30.0 50.0 56.9 20.0 (to 50.0) 6.9 (to 56.9)

  33. Decimals 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

  34. Subtraction by adding on. £4 6 .3 1 £7.85 - £3.49 = £4.36 £7.85- £3.49 +0.51 +3.0 +0.85 0.51 (to £4.00) 3.00 (to £7.00) 3.49 4.0 7.0 7.85 0.85 (to £7.85)

  35. Subtraction by adding on. £4 5 .3 1 £9.63 - £5.28 = £4.35 £9.63- £5.28 +0.72 +3.0 +0.63 0.72 (to £6.00) 3.00 (to £9.00) 5.28 6.0 9.0 9.63 0.63 (to £9.63)

  36. Subtraction by adding on. 8 £4 .6 £12.51 - £7.83 = £4.68 £12.51- £7.83 +0.17 +4.0 +0.51 0.17 (to £8.00) 4.00 (to £12.00) 7.83 8.0 12.0 12.51 0.51 (to £12.51)

  37. Subtraction by adding on. £6 2 .3 1 1 £23.94 - £17.62 = £6.32 £23.94 - £17.62 +0.38 +2.0 +3.0 +0.94 0.38 (to £18.0) 2.00 (to £20.0) 17.62 18.0 20.0 23.0 23.94 3.00 (to £23.0) 0.94 (to £23.94)

  38. Subtraction by adding on. 3 £7 .5 £35.12 - £27.59 = £7.53 £35.12 - £27.59 +0.41 +2.0 +5.0 +0.12 0.41 (to £28.00) 2.00 (to £30.00) 27.59 28.0 30.0 35.0 23.94 5.00 (to £35.00) 0.12 (to £35.12)

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