Grade 3Mathmedium
Practice Three-Digit
Practice Three-Digit — Subtraction worksheet for Grade 3.
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What Your Child Will Learn
- Solve three-digit subtraction problems with and without regrouping (borrowing) from the tens and hundreds places
- Demonstrate understanding of place value by accurately identifying which digit to borrow from when subtracting requires regrouping
- Apply the standard subtraction algorithm to three-digit numbers and verify answers using inverse operations (addition)
How to Use This Worksheet
- Step 1: Review the concept of regrouping by working through 1-2 problems aloud as a class. Model the language: 'Do I need to borrow? Yes, because 2 ones minus 7 ones doesn't work, so I borrow 1 ten (10 ones) from the tens place.'
- Step 2: Have students complete the first 3-4 problems with your support, checking their work together. Point out problems that may or may not require regrouping so students see the difference.
- Step 3: Release students to work independently on the remaining problems (typically 6-10), but encourage them to skip a problem if stuck and return to it after finishing others.
- Step 4: Review completed work together as a group, having volunteers explain their regrouping process for at least 2-3 problems. This builds confidence and reinforces the strategy.
- Step 5: For students who finish early, provide extension problems using larger three-digit numbers or create word problems that require three-digit subtraction.
Tips for Parents & Teachers
Watch for regrouping errors in the tens place—many students forget to reduce the tens digit by 1 after borrowing. Use base-10 blocks or drawings to make this concrete: show 10 ones bundled as 1 ten, then 'break apart' that ten when needed.
Address the common mistake of subtracting the smaller number from the larger number in each column regardless of position. Emphasize that we always subtract the bottom number from the top number, even if the top digit is smaller—that's when we borrow.
Have students line up numbers carefully by place value (ones under ones, tens under tens, hundreds under hundreds). Misalignment is a frequent source of errors at this level. Use grid paper or create columns with labels to support organization.
Frequently Asked Questions
How do I know if my child needs to regroup when subtracting three-digit numbers?
Look at each column from right to left (ones first, then tens). If the bottom digit is larger than the top digit in any column, you need to regroup (borrow) from the next column to the left. For example, in 342 - 157, the ones column has 2 - 7, which requires borrowing from the tens place.
My student keeps subtracting the top number from the bottom number. How can I help?
Use language like 'We're taking away the bottom number from the top number' and point with your finger from top to bottom repeatedly. Some students benefit from thinking of it as a number line or a story: 'We start with 342, and we're taking away 157.' Visual anchors and consistent directional language help reinforce the correct order of subtraction.
What's the best way to check three-digit subtraction answers?
Use the inverse operation: add the answer back to the number being subtracted. For example, if 342 - 157 = 185, check by adding 185 + 157. If you get 342, the answer is correct. This also reinforces the relationship between addition and subtraction.
Should my child write out the regrouping process or just do it in their head?
At Grade 3 medium difficulty, students should write down the regrouping steps. This means crossing out the tens digit, writing the new amount above it, and showing the ones they borrowed. Writing it out helps prevent errors and gives you insight into their thinking if they make a mistake.
How much practice is normal before mastering three-digit subtraction?
Most Grade 3 students need 2-3 weeks of regular practice (10-15 problems per session, 3-4 times per week) to feel confident with three-digit subtraction that includes regrouping. Every student is different, so look for consistency and accuracy rather than a specific timeline. Worksheets like this one are excellent for this regular practice.
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