Grade 3Mathmedium
Math Practice
Math Practice — Subtraction worksheet for Grade 3.
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What Your Child Will Learn
- Solve two-digit and three-digit subtraction problems with and without regrouping (borrowing) accurately
- Apply the subtraction algorithm correctly by identifying when regrouping is necessary and executing it properly
- Demonstrate understanding of place value by decomposing tens and hundreds when subtracting larger numbers
- Verify subtraction answers using addition as an inverse operation to build mathematical confidence and accuracy
How to Use This Worksheet
- Step 1: Review place value and regrouping. Have your student identify which problems will require regrouping by looking at each column (ones and tens) before attempting to solve. This builds metacognitive awareness.
- Step 2: Work through the first 2-3 problems together, modeling your thinking aloud. Explicitly say: 'I look at the ones column first. Can I subtract? If not, I regroup by borrowing 10 from the tens place. Now I can subtract.'
- Step 3: Have your student solve problems 4-7 independently while you observe. Prompt with questions like 'Do you need to regroup?' rather than correcting mistakes immediately.
- Step 4: Review student work together, celebrating correct answers and investigating errors using addition to check. Ask 'What went wrong here? Let's use addition to verify.'
- Step 5: Assign problems 8-10 as independent practice. Collect these to assess mastery of regrouping in subtraction, noting any persistent errors for future mini-lessons.
Tips for Parents & Teachers
Watch for the common mistake of subtracting the smaller digit from the larger digit in each column without considering place value. For example, in 32 - 15, students might compute 5 - 2 = 3 in the tens place. Reinforce that they must look at the actual digit values and regroup when needed.
Use the 'checking with addition' strategy after each problem. If 32 - 15 = 17, then 17 + 15 should equal 32. This helps students self-correct and builds confidence that subtraction and addition are inverse operations—a key G3 concept.
Create a visual anchor chart showing when regrouping is needed: 'If the bottom number's digit is bigger than the top number's digit in that column, you need to borrow from the next place value.' Reference this chart regularly until students internalize the pattern.
Encourage students to write out regrouping steps clearly, such as crossing out the tens digit and writing the regrouped amount above it. This visible organization prevents careless errors and helps you identify exactly where misconceptions occur.
Frequently Asked Questions
Why does my G3 student keep forgetting to regroup in subtraction problems?
Regrouping (borrowing) requires strong place value understanding and working memory. At G3, many students still think of numbers as collections of single digits rather than tens and ones. Use base-ten blocks or bundles of 10 sticks to show physically what happens when you 'break apart' a ten. Model this repeatedly before expecting independent regrouping. Also, have students write the regrouped numbers clearly above the problem to create a visual reference.
Should my child always check subtraction answers using addition?
Yes, at G3 this is an excellent habit to build. Using addition as a check leverages the inverse relationship between these operations, which is a critical G3 standard. It also builds independence because students can verify their own work without always relying on an adult. Make checking with addition a routine part of your practice, not an occasional extra step.
How do I know if my student is ready for three-digit subtraction with regrouping?
Your child should consistently solve two-digit subtraction with regrouping (like 42 - 18) before moving to three-digit problems. If they struggle with two-digit problems, focus there first. Once they can successfully regroup in the tens place, introduce three-digit subtraction. Start with problems that only require regrouping in the tens place before introducing problems that need regrouping in multiple places.
What's the best way to help my child who keeps getting subtraction and addition confused?
Create word problem context: 'If you have 25 stickers and give away 8, how many do you have left? That's SUBTRACTION—you're taking away.' Then: 'If you have 8 stickers and someone gives you 17 more, how many do you have now? That's ADDITION—you're putting together.' Use consistent language (subtract = take away, minus = take away; add = put together, plus = put together) and have your student act out problems physically whenever possible.
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