Three-digit addition and subtraction are among the most important computational skills Grade 3 students master. Third graders work with numbers up to 1,000, learning to regroup (carry) when adding and to borrow — including across zeros — when subtracting. These algorithms are used daily in word problems, money, and measurement, and they build the column-by-column thinking that carries directly into multi-digit multiplication and long division.
The most common challenge is managing regrouping correctly across all three place values, especially when subtracting from a number with a zero in the tens place, such as 800 − 456. In second grade, students added and subtracted two-digit numbers with regrouping; by fourth grade, they will extend these same algorithms to larger numbers and use them in multi-step problems. Solid Grade 3 fluency makes that transition straightforward.
Our three-digit addition and subtraction worksheets give third graders structured practice correcting regrouping errors, computing sums and differences within 1,000, applying estimation with rounding, and solving multi-step word problems — covering every aspect of this foundational skill.
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Browse all 12 printable worksheets below — click any card to open the full page.
Three-Digit Addition & Subtraction
Three-Digit Addition & Subtraction
Three-Digit Addition and Subtraction
Three-Digit Addition and Subtraction
Three-Digit Addition & Subtraction
Three-Digit Addition & Subtraction
Three-Digit Addition and Subtraction
Three-Digit Addition and Subtraction
Three-Digit Addition & Subtraction
Three-Digit Addition & Subtraction
Three-Digit Addition and Subtraction
Three-Digit Addition and Subtraction
What's Included in This Download
What You'll Learn
These three-digit addition & subtraction worksheets help grade 3 students develop essential math skills through engaging activities.
Learning Objectives
- Three-Digit Addition: With regrouping
- Three-Digit Subtraction: With borrowing
- Estimation: Use rounding
- Place Value: Apply place value
- Word Problems: Real-world problems within 1000
Skills Covered
How to Use These Worksheets
- Download & Print: Click the download button to get the PDF. Print on standard 8.5" x 11" paper.
- Start Simple: Begin with easier pages before moving to more challenging activities.
- Daily Practice: Dedicate 10-15 minutes each day for consistent learning.
- Use Manipulatives: Pair worksheets with physical objects like blocks or counters.
- Provide Encouragement: Celebrate progress and effort to build confidence.
- Check Progress: Use the included answer key to review work together.
Common Mistakes to Watch For
- Forgetting to add the carried digit in addition — after carrying a 1 to the tens column, students sometimes add the original tens digits and ignore the carry, producing an answer that is 10 too small.
- Subtracting the top digit from the bottom digit when the top is smaller — instead of borrowing, students flip the digits and subtract the smaller from the larger, giving a wrong difference for individual columns.
- Failing to borrow across zeros — when subtracting from a number like 800, students must borrow through the tens place (which has a zero), a two-step process that many students skip, leading to large errors in the result.
Frequently Asked Questions
What does regrouping mean in addition?
Regrouping in addition means that when a column sum is 10 or more, you write down the ones digit and carry the tens digit to the next column. For example, when adding 7 + 8 = 15 in the ones column, you write 5 and carry 1 to the tens column. This carried 1 must then be added with the tens digits in the next step.
How do you subtract when the top digit is smaller than the bottom digit?
You borrow 1 from the next column to the left. This increases the top digit by 10 and decreases the digit you borrowed from by 1. For example, in 63 − 27, the 3 in the ones column is smaller than 7, so you borrow from the tens: 13 − 7 = 6 ones, and the tens column becomes 5 − 2 = 3, giving 36.
How do you subtract from a number with a zero in the middle, like 800 − 456?
You must borrow through the zero. Since the tens digit is 0, you first borrow from the hundreds: the hundreds digit becomes 7, the tens digit becomes 10. Then borrow from the new tens digit: it becomes 9, and the ones digit becomes 10. Now you can subtract column by column: 10 − 6 = 4, 9 − 5 = 4, 7 − 4 = 3, giving 344.
How can you check a subtraction answer?
Add the difference to the smaller number — the result should equal the larger number you started with. For example, if you compute 532 − 278 = 254, check by adding 254 + 278. If the sum is 532, your subtraction is correct. This inverse-operation check is a habit that catches most errors quickly.
When do students need three-digit addition and subtraction in real life?
Any time they work with numbers in the hundreds — calculating how much money is left after a purchase, figuring out how many more items are needed to reach a goal, or adding up scores in a game. Word problems in Grade 3 math regularly involve three-digit numbers, so fluency with this skill reduces cognitive load and allows students to focus on the problem's meaning rather than the calculation.
Are these worksheets really free?
Yes! All our worksheets are 100% free to download and print. There's no subscription, no hidden fees, and no registration required.
Can I use these in my classroom?
Absolutely! Teachers are welcome to print and use these worksheets in their classrooms. Make as many copies as needed for your students.