The worksheet generator on this page produces 3rd grade missing number multiplication worksheets with real, freshly randomised numbers — 20 of them per sheet by default — plus the answer key a parent or teacher needs to mark it quickly. The version loaded below opens with items in the shape of 9 × □ = 99 and □ × 5 = 25; the key lists 11 and 5 next to their question numbers.
‘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 9 × □ = 99 asks the child to work backwards, and that is a genuinely different skill from computing forwards. The answer 11 cannot be reached by reading left to right and doing what the sign says.
The reliable strategy is the inverse operation: to find the box in 5 × □ = 25, undo what is being done. Say that out loud each time until the child says it first.
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 □ × 5 = 25 tend to find equations far less strange two or three years later.
The sheet uses facts to 12 with one factor hidden, so the difficulty is the reasoning, not the arithmetic.
Teachers usually place 3rd grade missing number multiplication 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 | 9 × □ = 99 | 11 | Watch for: treating the equals sign as 'the answer comes next' |
| 2 | □ × 5 = 25 | 5 | Check: using the same operation instead of the inverse |
| 3 | 5 × □ = 25 | 5 | Look at: writing the whole equation as the answer |
| 4 | □ × 4 = 36 | 9 | Ask about: ignoring the box and computing the two visible numbers |
| 5 | 10 × □ = 70 | 7 | Watch for: freezing when the box is first |
| 6 | □ × 11 = 77 | 7 | Check: guess-and-check without adjusting |
Take the first problem on the sheet as it stands, 9 × □ = 99. Work 9 × □ = 99 out on paper rather than in your head the first few times, say each step aloud, and check the result against 11 on the key before moving on.
The item □ × 5 = 25 is worth doing slowly. The answer to □ × 5 = 25 is 5, and the route to it is the route every other problem on this sheet takes — which is why the sheet has 20 of them rather than one.
Answers appear next to their question numbers, so a wrong item like □ × 5 = 25 can be found in the key in a second and re-worked while it is still fresh.
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.
For a class set, print one sheet, press the new-worksheet button and print again. Each child gets different numbers on the same skill, so nobody can copy the answer to 9 × □ = 99 from a neighbour.
Portrait orientation is what the sheet is designed for. Landscape works but wastes about a third of the paper, so leave the orientation alone unless you have a reason.
When these become easy, move along the related links below rather than adding more problems to the same sheet.
→ Free 3rd 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