Starting at 250, skip-count by 10, and fill in the missing numbers.
| 250, | 260, | 270, | ________ |
| ________ | ________ | 310, | ________ |
| 330, | ________ | ________ | ________ |
| ________ | ________ | ________ | ________ |
| ________ | ________ | 430, | ________ |
| ________ | ________ | ________ | 480, |
| 490, | ________ | ________ | 520, |
| ________ | 540, | ________ | ________ |
| 250, | 260, | 270, | 280 |
| 290, | 300, | 310, | 320 |
| 330, | 340, | 350, | 360 |
| 370, | 380, | 390, | 400 |
| 410, | 420, | 430, | 440 |
| 450, | 460, | 470, | 480 |
| 490, | 500, | 510, | 520 |
| 530 | 540 | 550 | 560 |
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