Starting at 3, skip-count by 3, and fill in the missing numbers.
| ______ | ______ | ______ | ______ | ______ | 18, | ______ |
| ______ | ______ | 30, | ______ | ______ | ______ | ______ |
| ______ | ______ | ______ | 54, | ______ | ______ | 63, |
| ______ | ______ | ______ | ______ | ______ | ______ | ______ |
| 3, | 6, | 9, | 12, | 15, | 18, | 21 |
| 24, | 27, | 30, | 33, | 36, | 39, | 42 |
| 45, | 48, | 51, | 54, | 57, | 60, | 63 |
| 66 | 69 | 72 | 75 | 78 | 81 | 84 |
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