1. Written Methods for Subtraction
Key Stage 2

2. decrease
reduce
fewer
Subtraction
less than
minus
difference between
take away

3. Start by counting up!!!
79- 46=

4. 79- 46= You can’t go wrong with a number line...

5. 79- 46=

6. 79- 46=
You can’t go wrong with a number line...

7. 79- 46= + 4

8. 79- 46=

9. 79- 46=

10. =

11. Now try one
Don’t worry I’m not going to mark it!!

12. You can do it another way but always.. Start with a number line....12

13. =
284

14. Think Partitioning
(100, 30,2)
284

15.
-100
184
284

16. Think Partitioning
284

17.
284

18. =152
284

19. Now it is your turn!!

20. Count up =
You can’t go wrong with a number line!
132
284

21. Count up = +8
132
140
284

22. Count up = +8
+60
284
132
140
200

23. Count up =
+80 +8
+60
284
132
140
200
280

24. Count up =
+80 +8
+60 +4
132
140
200
284
280

25. Count up
=152 =
152
+80 +8
+60 +4
132
140
200
284
280

26. Parents example
You try one!!

27. Lets move on to the vertical!
What will I do without my number line?
Be very careful with your presentation please..

28. You need some squared paper

29. You need some squared paper2 8 4 - 1 3

30. You need some squared paper2 8 4 - 1 3

31. You need some squared paper2 8 4 - 1 3

32. You need some squared paper2 8 4 - 1 3 6

33. You need some squared paper2 8 4 - 1 3 6

34. You need some squared paper2 8 4 - 1 3 6

35. You need some squared paper2 8 4 - 1 3 6

36. You need some squared paper2 8 4 - 1 3 6

37. You need some squared paper2 8 4 - 1 3 6

38. You need some squared paper2 8 4 - 1 3 6

39. You need some squared paper2 8 4 - 1 3 6 5

40. You need some squared paper2 8 4 - 1 3 6 5

41. Now it is your turn!!

42. H T U

43. H T U 2 8 4 - 1 3

44. H T U 2 8 4 - 1 3 5

45. Spot the difference?
What do you do now?

46. H T U 2 9 1 - 8 6

47. C O U N T P H 2 9 1 - 8 6 4

48. H T U 2 9 1 - 8 6 4

49. _ H T U 2 9 1 - 8 6 4

50. _ H T U 2 9 1 - 8 6 4

51. H T U 2 9 1 - 8 6 4 5

52. exchange H T U 2 9 1 - 8 6

53. H T U 2 89 11 - 1 8 6

54. H T U 2 89 11 - 1 8 6 5

55. Th H T U 6 4 7 - 2 8

56. Th H T U 6 4 7 - 2 8 3
Decomposition

57. Th H T U 6 34 16 7 - 2 8 4 3
Decomposition
exchange 1 hundred into tens’ column.

58. Th H T U 56
134 16 7 - 2 6 8 4 3
Decomposition
Exchange 1 thousand into hundreds’ column.

59. Th H T U 56
134 16 7 - 2 6 8 4 3
Decomposition

60. Subtraction: development
Using similar methods begin to subtract two or more three digit sums of money, with or without adjustment from the pence to the pounds.
Know that decimal points should line up under each other, particularly when subtracting mixed amounts such as £3.59 – 78p should be changed to £3.59-£0.78

61. Subtraction: development
Continue with the standard written methods using decomposition with three, four, five digit numbers and beyond.
Extend with decimals.