A three-digit number and ones
| 1. | 10 less, 10 more than 300 | |
| 2. | Number detectives 235+6 = * | |
| 3. | Addition Chains 100 + 5 + 5 + 7, 99 + 3 + 6 + 2 | |
| 4. | Beyond 100: 104 + 7 | |
| 5. | Beyond 110: 119+3 | |
| 6. | Beyond 120: 128+6 | |
| 7. | Beyond 130: 139 + 5 | |
| 8. | Changeover: 7 less than 301 | |
| 9. | Changeover: 6 less than 904 | |
| 10. | Changeover: 6 less than 503 | |
| 11. | Changeover: 7 less than 204 | |
| 12. | Changeover: 8 less than 305 |