Printable Adding Fractions Worksheets

Printable adding fractions worksheets for 4th and 5th grade, with an answer key on every sheet. The sets below cover 6 different skills, so you can start where your child actually is. Available as speed drills and fill in the blank.

Targeted Practice by Skill

About Adding Fractions

What this skill is

Adding fractions combines numerators over common denominators (2/7 + 3/7 = 5/7). For unlike denominators, students find common denominators (LCM) before adding numerators.

When children learn it

Adding like fractions is taught in 4th grade; unlike denominators are mastered in 5th grade, aligned to 4.NF.B.3 and 5.NF.A.1.

Teaching Tips

  • Keep the common denominator unchanged: add top numerators only.
  • Use fraction bar visuals to show why denominator pieces stay the same size.

Common Mistakes

  • Adding denominators together (writing 2/7 + 3/7 = 5/14).
  • Adding numerators without finding common denominators for unlike fractions.