Starting at 20, skip-count by 20, and fill in the missing numbers.
| ________ | ________ | 60, | ________ |
| ________ | 120, | ________ | ________ |
| ________ | ________ | ________ | ________ |
| ________ | ________ | ________ | ________ |
| ________ | ________ | ________ | ________ |
| ________ | ________ | ________ | ________ |
| 500, | ________ | 540, | ________ |
| 580, | ________ | ________ | 640 |
| 20, | 40, | 60, | 80 |
| 100, | 120, | 140, | 160 |
| 180, | 200, | 220, | 240 |
| 260, | 280, | 300, | 320 |
| 340, | 360, | 380, | 400 |
| 420, | 440, | 460, | 480 |
| 500, | 520, | 540, | 560 |
| 580 | 600 | 620 | 640 |
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