Starting at 240, skip-count by 20, and fill in the missing numbers.
| 240, | ________ | ________ | ________ |
| ________ | ________ | 360, | ________ |
| ________ | 420, | ________ | ________ |
| ________ | ________ | 520, | 540, |
| ________ | ________ | 600, | ________ |
| ________ | ________ | ________ | ________ |
| ________ | ________ | ________ | ________ |
| ________ | ________ | ________ | ________ |
| 240, | 260, | 280, | 300 |
| 320, | 340, | 360, | 380 |
| 400, | 420, | 440, | 460 |
| 480, | 500, | 520, | 540 |
| 560, | 580, | 600, | 620 |
| 640, | 660, | 680, | 700 |
| 720, | 740, | 760, | 780 |
| 800 | 820 | 840 | 860 |
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