This grade 1 adding tens worksheet gives 20 problems on adding and subtracting tens within 100, ordered from easy to hard, with a separate answer key.
These 20 problems practice adding and subtracting tens within 100 for Grade 1 (1.NBT.C.4, 1.NBT.C.5, 1.NBT.C.6). Students add ones to a two-digit number, add tens, find 10 more or 10 less in their heads, and subtract multiples of ten.
Base-ten blocks, a hundred chart, and number lines support the first problems. The last six problems are short stories.
Grade 1 Adding Tens Worksheet: problems 1–5
Problem 1: Add the ones with blocks
Use the picture to find \(32 + 4\).
Problem 2: Add the ones
Add.
- \(21 + 5\)
- \(43 + 3\)
- \(56 + 2\)
- \(70 + 8\)
Problem 3: Add tens to tens
Add.
- \(20 + 30\)
- \(40 + 10\)
- \(50 + 40\)
- \(30 + 60\)
Problem 4: Add tens with blocks
Use the picture to find \(24 + 30\).
Problem 5: Add tens to a number
Add.
- \(15 + 20\)
- \(32 + 40\)
- \(46 + 30\)
- \(51 + 20\)
Grade 1 Adding Tens Worksheet: problems 6–10
Problem 6: 10 more on the chart
What is 10 more than 45? Use the hundred chart.
Problem 7: 10 more in your head
Write the number that is 10 more.
- 23
- 58
- 71
- 86
Problem 8: 10 less in your head
Write the number that is 10 less.
- 47
- 62
- 90
- 35
Problem 9: 10 more or 10 less
Solve.
- What is 10 more than 64?
- What is 10 less than 64?
- What is 10 more than 39?
- What is 10 less than 28?
Problem 10: Subtract tens with blocks
The picture shows 60. Cross out 20. Find \(60 – 20\).
Grade 1 Adding Tens Worksheet: problems 11–15
Problem 11: Subtract tens
Subtract.
- \(50 – 20\)
- \(80 – 30\)
- \(90 – 60\)
- \(70 – 70\)
Problem 12: Make a ten to add
Add. Use the number line for part a.
- \(27 + 6\)
- \(38 + 5\)
- \(49 + 4\)
- \(65 + 7\)
Problem 13: Find the missing number
Find the missing number.
- \(34 + ? = 39\)
- \(40 + ? = 70\)
- \(50 – ? = 20\)
- \(? + 20 = 65\)
Problem 14: Find the mistake
Ethan says \(43 + 20 = 45\). Explain his mistake. Then write the correct sum.
Problem 15: Maya's stickers
Maya has 34 stickers. She buys 5 more stickers. How many stickers does she have now?
Grade 1 Adding Tens Worksheet: problems 16–20
Problem 16: Jamal's book
Jamal’s book has 80 pages. He has read 30 pages. How many pages are left?
Problem 17: Sofia's seashells
Sofia has 46 seashells. At the beach she finds 30 more. How many seashells does she have in all?
Problem 18: Diego's beads
Diego has 58 beads. A friend gives him 6 more beads. How many beads does Diego have now?
Problem 19: School store pencils
The school store has 70 pencils. It sells 30 pencils on Monday. On Tuesday, 20 more pencils arrive. How many pencils does the store have now?
Problem 20: Noah's marbles
Noah has 27 marbles. Priya gives him 30 more. Then Noah loses 10 marbles. How many marbles does Noah have now?
How to use this grade 1 adding tens worksheet
Print this grade 1 adding tens worksheet as a PDF, solve every problem on paper, then compare with the answer key.
See every chapter on the Grade 1 math page.
