1. © 2007, 2013 QUT YuMi Deadly Centre
YUMI DEADLY CENTRE School of Curriculum
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Additive Subtraction
YuMi Deadly Maths Past Project Resource
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© 2007, 2013 QUT YuMi Deadly Centre

2. © 2007, 2013 QUT YuMi Deadly Centre
99 Board
Additive Subtraction
These are predominantly templates, giving one or two examples for each type of activity. They can be duplicated and used to work with students in developing and consolidating understanding of the relevant concepts.
HOW TO USE THIS MATERIAL:
Do not use this material in slide show, it will not work. Right click, and select “End Show” to exit slide show.
For further details of how to use this material, please refer to Basic Maths Booklet VB2: Mathematics behind Whole-Number Numeration and Operations.
© 2007, 2013 QUT YuMi Deadly Centre

3. One example with answers One blank example
Additive subtraction using sequencing Fill the distance with 10s then 1s
One example with answers
One blank example
© 2007, 2013 QUT YuMi Deadly Centre

4. © 2007, 2013 QUT YuMi Deadly Centre
= 74 21
Example 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 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 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 90 91 92 93 94 95 96 97 98 99 1 1 1 1 1 1 10 10 10 10
Place the circle on the first number.
Place the hexagon on the answer.
Use the arrows to fill the distance between the two numbers.
Add up the arrows and type the answer in the box. 10 10 1
© 2007, 2013 QUT YuMi Deadly Centre

5. © 2007, 2013 QUT YuMi Deadly Centre
= 56 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 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 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 90 91 92 93 94 95 96 97 98 99 1 1 1 1 1 1 10 10 10 10 10
Place the circle on the first number.
Place the hexagon on the answer.
Use the arrows to fill the distance between the two numbers.
Add up the arrows and type the answer in the box.
© 2007, 2013 QUT YuMi Deadly Centre

6. © 2007, 2013 QUT YuMi Deadly Centre
Additive subtraction using compensation Overfill the distance with 10s then take away 1s
One example with answers
One blank example
© 2007, 2013 QUT YuMi Deadly Centre

7. © 2007, 2013 QUT YuMi Deadly Centre
= 65
Example 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 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 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 90 91 92 93 94 95 96 97 98 99 -1 -1 -1 -1 -1 10 10 10 10 10 10
Place the circle on the first number.
Place the hexagon on the answer.
Use the arrows to fill the distance between the two numbers.
Add up the arrows and type the answer in the box. 10 -1 10
© 2007, 2013 QUT YuMi Deadly Centre

8. © 2007, 2013 QUT YuMi Deadly Centre
= 53 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 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 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 90 91 92 93 94 95 96 97 98 99 -1 -1 -1 -1 -1 10 10 10 10 10 10
Place the circle on the first number.
Place the hexagon on the answer.
Use the arrows to fill the distance between the two numbers.
Add up the arrows and type the answer in the box.
© 2007, 2013 QUT YuMi Deadly Centre