Subtraction 3rd – 5th grade Adjusting One Number to Create an Easier Problem
Focus is on adjusting the whole (minuend) Category 1 Focus is on adjusting the whole (minuend)
9 – 4 10 – 4 19 – 4 20 – 14 May require more than one slide
15 – 5 14 – 5 10 – 5 11 – 5 May require more than one slide
20 – 15 21 – 15 19 – 15 22 – 15 May require more than one slide
31 – 15 30 – 15 29 – 15 32 – 15 May require more than one slide
51 – 25 50 – 25 49 – 25 52 – 25 May require more than one slide
50 – 28 49 – 28 60 – 28 59 – 28 May require more than one slide
30 – 19 29 – 19 40 – 19 39 – 19 May require more than one slide
37 – 18 38 – 18 44 – 25 45 – 25 May require more than one slide
99 – 73 100 – 73 100 – 64 100 – 82 May require more than one slide
Adjusting the subtrahend (part being removed) Category 2 Adjusting the subtrahend (part being removed)
20 – 10 20 – 9 20 – 11 21 – 9 May require more than one slide
25 – 15 25 – 16 25 – 18 25 – 19 May require more than one slide
40 – 20 40 – 19 40 – 21 40 – 18 May require more than one slide
30 – 15 30 – 16 30 – 14 30 – 19 May require more than one slide
50 – 25 50 – 24 50 – 26 50 – 19 May require more than one slide
60 – 30 60 – 29 60 – 31 60 – 39 May require more than one slide
70 – 30 70 – 31 70 – 29 70 – 49 May require more than one slide
80 – 40 80 – 39 80 – 41 80 – 49 May require more than one slide
100 – 50 100 – 51 100 – 49 100 – 52 May require more than one slide
Category 3
49 – 28 50 – 30 50 – 28 53 – 28 May require more than one slide
39 – 19 38 – 20 38 – 19 35 – 18 May require more than one slide
59 – 47 60 – 50 60 – 47 62 – 45 May require more than one slide
52 – 40 49 – 39 52 – 39 51 – 37 May require more than one slide
75 – 40 79 – 39 75 – 39 77 – 39 May require more than one slide
99 – 69 100 – 70 100 – 69 101 – 68 May require more than one slide
149 – 118 151 – 120 151 – 118 155 – 128 May require more than one slide
172 – 60 169 – 59 172 – 59 179 – 88 May require more than one slide
199 – 98 200 – 100 200 – 98 203 – 99 May require more than one slide