3rd grade
Estimate Sums and Differences
Ten problems to round, estimate and then solve. Kids check that the exact answer is close to the estimate.
Math worksheet · Addition and subtraction practice
Addition Square Puzzles
Six little number squares. Every row and column adds up to the number at its end. Find the missing numbers.
- Grade level
- Grades 2–3
- Time
- About 20 minutes
- Answer key
- Yes, page 2 of the PDF
- Kids practice
- Addition and subtraction facts, Regrouping, Mental math strategies, Checking with the inverse
What kids do
“Add across and add down. Fill in the missing numbers so every sum is right.”
Teacher tip
Ask kids to fill in the box with only one blank in its row or column first.
How to use it
- Keep a number line or hundred chart taped to the desk for kids who need it.
- Use it as a timed sheet once a week and have kids chart their own score.
- Do the first problem together under a document camera, then let kids finish on their own.
Watch for
Subtracting the smaller digit from the bigger one in each column (54 − 27 = 33). Ask kids to say “Can I take 7 from 4?” before they write.
Talk about it
- Show me one problem where you had to regroup. Why?
- Which problem was the hardest? What made it hard?
Take it further
Turn three problems into story problems and illustrate one of them.
US Letter, prints well in black and white. Free for home and classroom use: print as many copies as you need.
More addition and subtraction practice worksheets
3rd grade
Four-Digit Addition and Subtraction
Fifteen stacked problems with thousands, hundreds, tens and ones, most with regrouping.
3rd grade
Subtraction Across Zeros
Fifteen problems like 400 − 167 and 3,005 − 1,248, where kids have to regroup across one or more zeros.
Grades K–1
Picture Addition Within 10
Count two groups of dots and add them: eight picture problems with sums up to 10.
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