Grades 1–2
Two-Digit Addition with Base-Ten Blocks
Six problems drawn as tens rods and ones cubes. Kids put the tens together, then the ones, and write the sum.
Math worksheet · Addition and subtraction practice
Add and Subtract Tens
Thirty mental math problems like 30 + 40, 90 − 60 and 45 + 30. Only the tens change!
- Grade level
- Grades 1–2
- Time
- About 15 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 or subtract the tens. The ones stay the same!”
Teacher tip
Show it with tens rods: only the rods change, the loose ones stay put.
How to use it
- Ask kids to circle the problems they are sure of first, then go back to the tricky ones.
- Keep a number line or hundred chart taped to the desk for kids who need it.
- Do the first problem together under a document camera, then let kids finish on their own.
Watch for
Columns that drift. Turn lined paper sideways or use graph paper to keep digits lined up.
Talk about it
- Which answer could you check by doing the opposite operation?
- 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
Grades 2–3
Open Number Line: Jump by Tens and Ones
Six problems within 100 with an empty number line. Kids jump by tens, then ones, and write where they land.
Grades 2–3
Addition Square Puzzles
Six little number squares. Every row and column adds up to the number at its end. Find the missing numbers.
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.
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