Starting at 1,700, skip-count by 400, and fill in the missing numbers.
| 3,300 | ||||
| 4,100 | ||||
| 6,100 | 6,900 | 7,300 | ||
| 8,500 | 8,900 | |||
| 1,700 | 2,100 | 2,500 | 2,900 | 3,300 |
| 3,700 | 4,100 | 4,500 | 4,900 | 5,300 |
| 5,700 | 6,100 | 6,500 | 6,900 | 7,300 |
| 7,700 | 8,100 | 8,500 | 8,900 | 9,300 |
| 9,700 | 10,100 | 10,500 | 10,900 | 11,300 |
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