Adding and Subtracting 10s Worksheets: Only the Tens Digit Changes

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20 problems. Whole tens, plus and minus mixed: 30 + 50, 90 − 50. Sheet 2IILD0, with its answer key.

Whole tens, plus and minus mixed: 30 + 50, 90 − 50

Name Date Score / 20

Read each sentence and write the missing number.

  1. 1.40 + 10 = _____
  2. 2.10 + 20 = _____
  3. 3.80 − 50 = _____
  4. 4.70 − 60 = _____
  5. 5.80 − 20 = _____
  6. 6.80 − 30 = _____
  7. 7.40 + 20 = _____
  8. 8.20 + 20 = _____
  9. 9.70 − 50 = _____
  10. 10.10 + 70 = _____
  11. 11.40 − 30 = _____
  12. 12.10 + 80 = _____
  13. 13.80 − 40 = _____
  14. 14.40 + 50 = _____
  15. 15.70 + 10 = _____
  16. 16.70 − 30 = _____
  17. 17.50 − 30 = _____
  18. 18.20 + 70 = _____
  19. 19.50 − 20 = _____
  20. 20.50 + 40 = _____

Sheet 2IILD0 · Made at homeroomtools.com

Answer key. Whole tens, plus and minus mixed: 30 + 50, 90 − 50

  1. 1.40 + 10 = 50
  2. 2.10 + 20 = 30
  3. 3.80 − 50 = 30
  4. 4.70 − 60 = 10
  5. 5.80 − 20 = 60
  6. 6.80 − 30 = 50
  7. 7.40 + 20 = 60
  8. 8.20 + 20 = 40
  9. 9.70 − 50 = 20
  10. 10.10 + 70 = 80
  11. 11.40 − 30 = 10
  12. 12.10 + 80 = 90
  13. 13.80 − 40 = 40
  14. 14.40 + 50 = 90
  15. 15.70 + 10 = 80
  16. 16.70 − 30 = 40
  17. 17.50 − 30 = 20
  18. 18.20 + 70 = 90
  19. 19.50 − 20 = 30
  20. 20.50 + 40 = 90

Sheet 2IILD0 · Made at homeroomtools.com

Next step Tens and ones in grade 1Add any two 2-digit numbers

How it works

These adding and subtracting 10s worksheets change only the tens digit. The opening sheet mixes whole tens, 30 + 50 and 90 − 50; others add or take away 10, as in 33 + 10 = 43.

Read the full guide

Whole tens first

The opening sheet works like 3 + 5 and 9 − 5 with a zero behind: 30 + 50 = 80, 90 − 50 = 40. Half its problems add and half subtract. As an adding multiples of 10 worksheet, Adding multiples of 10: 40 + 50 keeps to one sign. Common Core 1.NBT.4, 1.NBT.5 and 1.NBT.6 place these sums in grade 1.

Ten more, ten less

10 more or 10 less in a line: 33 + 10, 57 − 10 changes one ten of a 2-digit number, and 10 less and 10 more than a number, in a table asks for both at once. For a subtracting 10 worksheet with no additions on it, choose Subtracting 10 only: 74 − 10.

  • Let pupils run a finger down one column of a hundreds chart: each step down is 10 more.
  • After each answer ask what stayed the same. It should be the ones digit.

Questions and answers

What is 10 more and 10 less than a number?

10 more is the number with one more ten: 57 becomes 67. 10 less has one ten fewer: 57 becomes 47. The ones digit does not change, so no counting is needed.

What grade are these sheets for?

Grade 1, where pupils find 10 more or 10 less in their heads and add or subtract whole tens up to 90. The sheet that crosses a hundred and the 3-digit sheet go a step further.

Is there an answer key?

Yes. The key prints as the last page with every blank filled in. Untick Answer key before you press Print to leave it out.

Why do some sheets have only one sign?

For first lessons. A class that has just met plus 10 can print the adding sheet, then the subtracting sheet, and move to a mixed sheet when both are secure.

All 12 sheet types

Whole tens with whole tens 3

  • Adding multiples of 10: 40 + 50 Adding only: 40 + 50 = 90, 20 + 30 = 50. Pupils count the tens, 4 tens and 5 tens make 9 tens, and write the zero. Every sum is 90 or less.
  • Subtracting multiples of 10: 80 − 50 Subtracting only: 80 − 50 = 30, 70 − 40 = 30. Whole tens up to 90 are taken from whole tens, and an answer of zero can turn up, as in 60 − 60 = 0.
  • Whole tens, plus and minus mixed: 30 + 50, 90 − 50 Both numbers are whole tens: 30 + 50 = 80 and 90 − 50 = 40. They work like 3 + 5 and 9 − 5 with a zero behind. Half the problems add and half subtract; nothing passes 90.
Show all 12 sheet types (9 more)

10 more and 10 less 5

  • 10 less and 10 more than a number, in a table A table with the number in the middle column: for 52 pupils write 42 on the left and 62 on the right, since 52 − 10 = 42 and 52 + 10 = 62. Both answers are asked for every number.
  • 10 more or 10 less across a hundred: 290 + 10 Here the tens digit is a 9 or a 0, so the hundreds change too: 290 + 10 = 300 and 404 − 10 = 394. A harder sheet for pupils who are sure of the 2-digit ones.
  • 10 more or 10 less in a line: 33 + 10, 57 − 10 Twenty 2-digit numbers with 10 added or 10 taken away, in mixed order: 33 + 10 = 43 and 57 − 10 = 47. Only the tens digit moves; the ones digit is the same before and after.
  • Adding 10 only: 33 + 10 One sign for a first lesson: 33 + 10 = 43, 88 + 10 = 98. Pupils say the number of tens, add one more ten and keep the ones as they are. No answer passes 99.
  • Subtracting 10 only: 74 − 10 Twenty subtractions of 10 and nothing else: 74 − 10 = 64, 98 − 10 = 88, 11 − 10 = 1. One ten comes off and the ones stay. Use it after the adding sheet and before the mixed one.

A number with whole tens 4

  • 2-digit plus or minus whole tens: 19 + 70, 77 − 60 A 2-digit number with whole tens added or taken away: 19 + 70 = 89 and 77 − 60 = 17. The ones digit never changes, so pupils work with the tens alone. Half the problems subtract.
  • 3-digit plus or minus whole tens: 230 + 10, 448 − 30 The same step with a hundreds digit in front: 230 + 10 = 240 and 448 − 30 = 418. No problem crosses a hundred, so the hundreds and the ones both stay as they are.
  • Missing tens: 45 + ___ = 75, 77 − ___ = 17 The number of tens is the blank: 45 + ___ = 75 or 77 − ___ = 17. Pupils compare the tens digits, 4 and 7, and write 45 + 30 = 75, or 77 − 60 = 17.
  • Tens under tens: 2-digit plus whole tens in columns Twelve additions set out in columns, such as 27 + 40 = 67. The zero of the 40 stands under the ones, so the ones digit drops straight into the answer and only the tens are added.

How this list was compiled: The sheet types and worked examples were written for this page; every problem is made by the sheet generator and every worked example was computed by script on 2026-10-01. Where these sums sit in school was read in the full text of the Common Core State Standards for Mathematics (California Department of Education copy, https://www.cde.ca.gov/be/st/ss/documents/ccssmathstandardaug2013.pdf), read on 2026-10-01: 1.NBT.4 has grade 1 add a two-digit number and a multiple of 10 within 100, 1.NBT.5 asks pupils to find 10 more or 10 less than a two-digit number mentally, without having to count, and 1.NBT.6 has them subtract multiples of 10 in the range 10 to 90 from multiples of 10 in the same range. Licence: own work

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