| 74-28= | 74 – 20 = 54 | 54 – 8 = | 46 |
| 92 – 39 = | 92-30=62 | 62-9= | 53 |
| 91-54= | 91-50=41 | 41-4= | 37 |
| 84-56= | 84-50=35 | 35-6= | 29 |
| 86-59= | 86-50=36 | 36-9= | 27 |
| 153-68= | 153-60=93 | 93-8= | 85 |
| 134-65= | 134-60=74 | 74-5= | 69 |
| 161-74= | 161-70=91 | 91-4= | 87 |
| 73-58= | 73-50=23 | 23-8= | 15 |
| 153-27= | 153-20=133 | 133-7= | 126 |
| 242-73= | 242-70=172 | 172-3= | 169 |
| 164-48= | 164-40=124 | 124-8= | 116 |
| 153-25= | 153-20=133 | 133-5= | 128 |
| 55-39= | 55-30=25 | 25-9= | 16 |
| 143-31= | 143-30=113 | 113-1= | 112 |
| 145-26= | 145-20=125 | 125-6= | 19 |