Subtraction - NSW Department of Education

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19. 29. 39. 49. 59. 69. 79. 89. 99. 87 – 34 = 53. □ could be done... 87 – 10 – 10 – 10 – 1 – 1 – 1 – 1
Subtraction Jump strategy (another way to subtract) Children may start from the largest number and jump back from it to get the final answer. Using the jump strategy on a hundred chart

87 – 34 = 53 0

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10 11

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could be done...

87 – 10 – 10 – 10 – 1 – 1 – 1 – 1

20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

answer

60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89

start

90 91 92 93 94 95 96 97 98 99

0

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10 11

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9

12 13 14 15 16 17 18 19

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or could be done...

87 – 30 – 4

20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

answer

60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89

start

90 91 92 93 94 95 96 97 98 99

For more homework help, tips and info sheets go to www.schoolatoz.com.au © Owned by State of NSW through the Department of Education and Communities 2011. This work may be freely reproduced and distributed for non-commercial educational purposes only. Permission must be received from the department for all other uses.

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Using the jump strategy on an empty number line

87 – 34 = 53 ■

could be done ...

87 – 10 – 10 – 10 – 1 – 1 – 1 – 1

–1 –1 –1 –1 answer

53

– 10

57

– 10

67

– 10

77

87 start

Students record the jumps they make and where they land on the line until they get to the answer.

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or could be done ...

87 – 30 – 4

– 30

–4

53

57

87

answer

start

There are many ways to get the same answer.

For more homework help, tips and info sheets go to www.schoolatoz.com.au © Owned by State of NSW through the Department of Education and Communities 2011. This work may be freely reproduced and distributed for non-commercial educational purposes only. Permission must be received from the department for all other uses.

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