This page makes free printable 2nd grade expanded form 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 Write 629 in expanded form and Write 840 in expanded form, and the answers (600 + 20 + 9 and 800 + 40) 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.
Place value is the idea that a digit's position decides its size, and a question like Write 629 in expanded form checks that directly. A child who answers 600 + 20 + 9 without counting positions on their fingers has internalised the structure; one who counts has not, yet.
Notice that zeros are included deliberately. A zero holding a place is the concept most often missed, and it is why a question like Write 985 in expanded form catches children who are counting positions by eye.
Nearly every later arithmetic error traces back to place value: misaligned columns, a lost zero, a decimal point in the wrong slot. Ten minutes a day here quietly fixes problems that look like they belong to other topics.
Reading a number aloud correctly is half the skill. Children who say the digits one by one rather than naming the whole number usually cannot answer Write 840 in expanded form without recounting.
In US classrooms these 2nd grade expanded form worksheets are commonly aligned with the number and operations in base ten strand for this grade, though the exact wording varies from state to state.
| # | Problem | Answer | What to check |
|---|---|---|---|
| 1 | Write 629 in expanded form = | 600 + 20 + 9 | Watch for: mixing up tens and ones vocabulary |
| 2 | Write 840 in expanded form = | 800 + 40 | Check: counting from the wrong end |
| 3 | Write 240 in expanded form = | 200 + 40 | Look at: reading a comma as a decimal point |
| 4 | Write 985 in expanded form = | 900 + 80 + 5 | Ask about: confusing the digit with its value |
| 5 | Write 319 in expanded form = | 300 + 10 + 9 | Watch for: losing track in long numbers |
| 6 | Write 993 in expanded form = | 900 + 90 + 3 | Check: skipping the zero |
Work Write 985 in expanded form out loud as a demonstration. It gives 900 + 80 + 5. Children who hear Write 985 in expanded form reasoned through once at the start of a session make noticeably fewer errors in the ten minutes that follow.
The item Write 840 in expanded form is worth doing slowly. The answer to Write 840 in expanded form is 800 + 40, 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.
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 600 + 20 + 9 for Write 629 in expanded form.
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.
To save these 2nd grade expanded form 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.
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.
Keep the finished 2nd grade expanded form worksheets in date order — the drop in time across ten sheets is the clearest progress report you will get.
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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