If you need 2nd grade missing number worksheets that you can print right now, this page builds them for you — 20 fresh problems, an answer key underneath, and no account to create first. Right now the generator is set to problems such as 5 × □ = 30 (answer 6) and 8 + □ = 11 (answer 3); press the button again and the numbers change while the skill stays the same.
‘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.
A missing-number problem such as 5 × □ = 30 asks the child to work backwards, and that is a genuinely different skill from computing forwards. The answer 6 cannot be reached by reading left to right and doing what the sign says.
These problems are the first real algebra a child meets. The empty box is a variable in everything but name, and children who are comfortable with 8 + □ = 11 tend to find equations far less strange two or three years later.
The reliable strategy is the inverse operation: to find the box in 4 − □ = 2, undo what is being done. Say that out loud each time until the child says it first.
The sheet mixes the position of the missing value, so the box sometimes sits in the first slot and sometimes in the answer slot. Children who have only met one arrangement usually stall on the other.
Teachers usually place 2nd grade missing number worksheets alongside the operations and algebraic thinking strand for this grade, which is where the skill sits in the majority of US state frameworks.
| # | Problem | Answer | What to check |
|---|---|---|---|
| 1 | 5 × □ = 30 | 6 | Watch for: treating the equals sign as 'the answer comes next' |
| 2 | 8 + □ = 11 | 3 | Check: guess-and-check without adjusting |
| 3 | 4 − □ = 2 | 2 | Look at: using the same operation instead of the inverse |
| 4 | 3 × □ = 9 | 3 | Ask about: freezing when the box is first |
| 5 | 6 + □ = 8 | 2 | Watch for: writing the whole equation as the answer |
| 6 | 5 − □ = 2 | 3 | Check: ignoring the box and computing the two visible numbers |
Work 3 × □ = 9 out loud as a demonstration. It gives 3. Children who hear 3 × □ = 9 reasoned through once at the start of a session make noticeably fewer errors in the ten minutes that follow.
A good first problem to do together is 5 × □ = 30, which comes out at 6. Do 5 × □ = 30 once with the child narrating, then hand over the pencil and start the clock on the other 20 problems.
Because the numbers are random, there is no shared answer list to look up: the key printed behind your sheet is the only one that fits it, and it shows 6 for 5 × □ = 30.
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 2nd grade missing number 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.
If the problems look cramped, drop the count from 20 to a smaller number before printing these 2nd grade missing number worksheets; the font stays the same size and the spacing opens up.
When these become easy, move along the related links below rather than adding more problems to the same sheet.
→ Free 2nd Grade Math Worksheets · → Free Missing Number 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