Adding fractions with like denominators

  • Level: Grade 4
  • Free
  • Printable
  • Answer key included

When denominators are the same, only the numerators are added. The answer key simplifies results and converts improper fractions to mixed numbers.

Live previewUpdates as you change the options
Adding fractions with like denominators
Name: Date: Score: / 20

Add. Simplify your answer.

  1. 1.
    38+78=
  2. 2.
    28+48=
  3. 3.
    37+47=
  4. 4.
    611+211=
  5. 5.
    15+25=
  6. 6.
    312+912=
  7. 7.
    46+46=
  8. 8.
    811+911=
  9. 9.
    35+45=
  10. 10.
    13+23=
  11. 11.
    512+212=
  12. 12.
    35+35=
  13. 13.
    67+17=
  14. 14.
    510+410=
  15. 15.
    811+311=
  16. 16.
    512+1012=
  17. 17.
    48+78=
  18. 18.
    610+210=
  19. 19.
    18+78=
  20. 20.
    23+23=
MathSheetLabWorksheet #543172
Adding fractions with like denominators Answer key
  1. 1.
    38+78=114
  2. 2.
    28+48=34
  3. 3.
    37+47=1
  4. 4.
    611+211=811
  5. 5.
    15+25=35
  6. 6.
    312+912=1
  7. 7.
    46+46=113
  8. 8.
    811+911=1611
  9. 9.
    35+45=125
  10. 10.
    13+23=1
  11. 11.
    512+212=712
  12. 12.
    35+35=115
  13. 13.
    67+17=1
  14. 14.
    510+410=910
  15. 15.
    811+311=1
  16. 16.
    512+1012=114
  17. 17.
    48+78=138
  18. 18.
    610+210=45
  19. 19.
    18+78=1
  20. 20.
    23+23=113
MathSheetLabWorksheet #543172

About this worksheet

Each sheet contains 16, 20 or 24 problems (your choice) and is generated at random. Press “New problems” as many times as you like; there is no limit and no account needed.

Worked example

712+1112=
  1. The denominators are the same (12), so keep 12 and add the numerators: 7 + 11 = 18. That gives 18/12.
  2. Simplify: divide the top and bottom by 6. 18/12 = 3/2.
  3. 3/2 is more than 1: 3 ÷ 2 = 1 remainder 1, so 3/2 = 1 and 1/2.

Answer: 1 and 1/2

Teaching tips

  • A common error is adding the denominators too; fraction strips make the reason clear.

How to print or save as PDF

  1. Choose the options on the left (on a phone, above the preview).
  2. Press Print / Save as PDF.
  3. In the print window, pick your printer, or choose “Save as PDF” as the destination.

Only the worksheet and its answer key are printed; menus and buttons are hidden automatically.

Related worksheets

More fractions worksheets