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Think of subtraction as finding the difference between 2 numbers. As long as they both increase by the same amount, the difference will always remain the same.

For example, if you work for 32 hours and your friend works 28 hours, the difference is 4 hours. If you then both work an another 12 hours, the difference is still 4 hours.

Use this idea to make the subtractions below easier. Add to the bottom number to make a multiple of 10 and then add that same number to the top number before doing the subtraction. The first one is done for you.

83  +2  arrow pointing right  85 
- 38  +2  arrow pointing right -  40 
       45 
93  +2  arrow pointing right  95 
- 58  +2  arrow pointing right -  60 
       35 
85  +3  arrow pointing right  88 
- 47  +3  arrow pointing right -  50 
       38 
72  +4  arrow pointing right  76 
- 46  +4  arrow pointing right -  50 
       26 
64  +2  arrow pointing right  66 
- 58  +2  arrow pointing right -  60 
       6 
56  +3  arrow pointing right  59 
- 37  +3  arrow pointing right -  40 
       19 

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42  +5  arrow pointing right  47 
- 25  +5  = -  30 
       17 
97  +2  arrow pointing right  99 
- 68  +2  = -  70 
       29 
83  +3  arrow pointing right  86 
- 47  +3  arrow pointing right -  50 
       36 
75  +4  arrow pointing right  79 
- 56  +4  arrow pointing right -  60 
       19 
67  +2  arrow pointing right  69 
- 38  +2  arrow pointing right -  40 
       29 
57  +1  arrow pointing right  58 
- 29  +1  arrow pointing right -  30 
       28 
44  +2  arrow pointing right  46 
- 28  +2  arrow pointing right -  30 
       16 
91  +5  arrow pointing right  96 
- 75  +5  arrow pointing right -  80 
       16 

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84  +3  arrow pointing right  87 
- 67  +3  = -  70 
       17 
72  +4  arrow pointing right  76 
- 36  +4  = -  40 
       36 
62  +2  arrow pointing right  64 
- 28  +2  arrow pointing right -  30 
       34 
56  +3  arrow pointing right  59 
- 37  +3  arrow pointing right -  40 
       19 
92  +1  arrow pointing right  93 
- 19  +1  arrow pointing right -  20 
       73 
62  +5  arrow pointing right  67 
- 25  +5  arrow pointing right -  30 
       37 
41  +3  arrow pointing right  44 
- 17  +3  arrow pointing right -  20 
       24 
83  +1  arrow pointing right  84 
- 49  +1  arrow pointing right -  50 
       34 

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