2nd Grade Math · Adding and Subtracting Within 1000
Addition with regrouping Worksheets
Fresh practice, ready to print. Answer key included.
Three-digit sums where at least one column makes 10 or more, such as 368 + 275.
Make it yours
Or start with a ready-made version.
How it works: a quick refresher
The rules this worksheet practices, then one problem worked from start to finish.
| Strategy | How it works |
|---|---|
| Line up hundreds, tens, and ones | Write the numbers in three columns and start at the ones. |
| Regroup when adding | If a column adds to 10 or more, write the ones digit of that sum and carry 1 to the next column. |
| Regroup when subtracting | If the top digit is smaller, take 1 from the column to its left and add 10 to the digit you are on. |
| The sum stays under 1000 | These pages never make a thousands digit. |
| Check a difference by adding | The answer plus the bottom number should equal the top number. |
Worked example
Find 542 − 217.
- 1Ones: 2 is less than 7, so regroup. The 4 tens become 3 tens, and the ones become 12.
- 212 − 7 = 5. Write 5 in the ones place.
- 3Tens: 3 − 1 = 2. Hundreds: 5 − 2 = 3.
- 4542 − 217 = 325. Check: 325 + 217 = 542.
Ready-made versions
Three fixed versions you can link to or share. Each is a PDF with its own answer key.
- Addition with regrouping Worksheets, version 1Worksheet PDFAnswer key PDF
- Addition with regrouping Worksheets, version 2Worksheet PDFAnswer key PDF
- Addition with regrouping Worksheets, version 3Worksheet PDFAnswer key PDF
Grade level and standard
Written for 2nd grade math (place value) and aligned to CCSS 2.NBT.B.7. It also works as review in later grades.
Common questions
- Is there an answer key?
- Yes. Every worksheet has a matching answer key with each answer worked on the same grid or layout as the question. The worksheet ID printed at the bottom of each page pairs a sheet with its key.
- How is this different from the grade 3 fluency pages?
- These pages teach the steps one kind at a time, including problems that do not regroup. The grade 3 pages are a fluency review: regrouping in two places, and subtracting across a zero.
- Will any answer be 1000 or more?
- No. Every sum is 999 or less, and every difference is a positive whole number.
- How many different versions are there?
- About a million per skill. Each time you press the button the problems are generated fresh, so you can print a different version for every student, a retake, or another night of practice.
- Are the worksheets free?
- Yes. They are free to print and copy for your home or classroom, with no sign-up.