This page makes free printable skip counting by 3 worksheets on demand: press the button and you get a new sheet of 20 problems with a matching answer key, ready for US Letter or A4 paper. The current sheet starts with problems like 18, 21, 24, □, □ and 24, 27, 30, □, □, and the answers (27, 30 and 33, 36) are printed on the key so marking takes about a minute.
‘New set of problems’ opens the generator in its own tab. There you can change the problem count and turn the answer key on or off. ‘Print or save as PDF’ opens the print dialog — choose Save as PDF in the printer list to keep the file. The sheet fits US Letter and A4, and the answer key prints on its own page.
The pattern is what matters here, not the arithmetic. Children who can extend 24, 27, 30, □, □ without adding each step have internalised the step size, and that is the point at which the matching table becomes easy.
Sequences here start from varied points rather than always from the step size, which is what stops the exercise from becoming a recitation — see 24, 27, 30, □, □.
Skip counting is multiplication before the word is introduced. A sequence like 18, 21, 24, □, □, continued correctly to 27, 30, is the times table arriving through the front door instead of by memorisation.
Each row asks for two more terms — 27, 30 completes 18, 21, 24, □, □ — so the step has to be applied twice and the second one cannot be luck.
These skip counting by 3 worksheets are commonly aligned with the counting sequence and multiplication readiness expectations for this grade, and the skill appears in most curricula somewhere around this point.
| # | Problem | Answer | What to check |
|---|---|---|---|
| 1 | 18, 21, 24, □, □ | 27, 30 | Watch for: counting on by ones under their breath |
| 2 | 24, 27, 30, □, □ | 33, 36 | Check: losing the pattern across a hundred boundary |
| 3 | 15, 18, 21, □, □ | 24, 27 | Look at: restarting the sequence from zero |
| 4 | 9, 12, 15, □, □ | 18, 21 | Ask about: adding the wrong step after the first term |
| 5 | 12, 15, 18, □, □ | 21, 24 | Watch for: reversing direction |
| 6 | 6, 9, 12, □, □ | 15, 18 | Check: writing only one of the two missing terms |
Work 9, 12, 15, □, □ out loud as a demonstration. It gives 18, 21. Children who hear 9, 12, 15, □, □ reasoned through once at the start of a session make noticeably fewer errors in the ten minutes that follow.
Try 15, 18, 21, □, □ together before letting the child start alone. The answer to 15, 18, 21, □, □ is 24, 27, and talking through how it was reached takes about a minute and saves several minutes of guessing later in the sheet.
The key prints on its own page by default. Uncheck the answer-key box before printing if you would rather keep it back and mark the sheet yourself.
Every generated sheet carries its own key on a separate printed page, which lets a child self-mark without seeing the answers while they work.
To save these skip counting by 3 worksheets instead of printing them, choose 'Save as PDF' in the printer list. You get the worksheet and the answer key as a single PDF, on Letter or A4 depending on your printer settings.
The sheet is laid out to fit one page on both US Letter and A4. Leave the browser scaling at 100% and turn headers and footers off, and the 20 problems land inside the margins on either paper size.
Print a sheet of skip counting by 3 worksheets, run it for 10 minutes, mark it together, and come back tomorrow for a different set of numbers on the same skill.
→ Free Skip Counting Worksheets
Free printable math worksheets from a working math academy director in Korea. Problems come from our own code, not from a published workbook. Every sheet prints on US Letter or A4 with its answer key. All worksheets · Worksheet generator · Korean site
Last updated: 2026-09-13