Adding Fractions with Like Denominators Worksheets, Subtracting Too

Press Make a new sheet for twelve new sums with one denominator, or pick subtracting under Sheet type, then Print.

Sheet type

Problems

Answer key

12 problems. Add the numerators, keep the denominator: 3/8 + 2/8. Sheet E36DXE, with its answer key.

Add the numerators, keep the denominator: 3/8 + 2/8

Name Date Score / 12

Add. Write each answer just as it comes out. There is no need to reduce it.

1. + = ________
2. + = ________
3. + = ________
4. + = ________
5. + = ________
6. + = ________
7. + = ________
8. + = ________
9. + = ________
10. + = ________
11. + = ________
12. + = ________

Sheet E36DXE · Made at homeroomtools.com

Answer key. Add the numerators, keep the denominator: 3/8 + 2/8

1. + =
2. + =
3. + =
4. + =
5. + =
6. + =
7. + =
8. + =
9. + =
10. + =
11. + =
12. + =

Sheet E36DXE · Made at homeroomtools.com

Next step More grade 4 fraction sheets Make a whole-number practice sheet

How it works

These adding fractions with like denominators worksheets keep one denominator in every problem, so the only step is adding the numerators. The page opens on twelve sums under 1. Sheet type has sums past 1, subtracting and missing fractions.

Read the full guide

Why the denominator stays

The denominator names the size of the part and the numerator counts the parts. Three eighths and two eighths are five eighths: 3/8 + 2/8 = 5/8. A pupil who writes 5/16 has added the sizes too. An adding fractions with same denominator worksheet drills that one idea before unlike denominators arrive.

From sums under 1 to sums past 1

Two fractions that make 1 whole: 3/8 + 5/8 shows that 8/8 is 1. After it, Sums past 1, written as mixed numbers: 4/5 + 3/5 takes the whole out: 4/5 + 3/5 = 7/5 = 1 2/5. For an adding and subtracting fractions like denominators worksheet in one lesson, print the opening sheet and Subtract the numerators: 7/10 − 3/10.

Neither standards text asks for lowest terms. Pick Add, then write the sum in lowest terms: 1/6 + 3/6 only when you want that step marked.
Take a fraction from 1 whole: 1 − 3/8 is the sum behind every problem that asks what fraction is left.

Questions and answers

How do you add fractions with like denominators?

Add the numerators and keep the denominator: 2/9 + 5/9 = 7/9. The denominator does not change, because both fractions count ninths. Subtracting works the same way: 7/10 − 3/10 = 4/10.

Are these adding fractions with common denominators worksheets too?

Yes. Like, same and common denominators all say that the two fractions are cut into parts of one size, so nothing has to be renamed before adding.

What grade are addition of fractions with like denominators worksheets for?

Grade 4. Common Core 4.NF.3a treats adding and subtracting fractions as joining and separating parts of the same whole, and Texas 4.3(E) names fractions with equal denominators. Unlike denominators come in grade 5.

Is there an answer key?

Yes. The key prints as the last page with every sum worked, and on the lowest terms sheets it names the factor divided out. To print the problems alone, untick Answer key before you press Print.

All 16 sheet types

Add, sums of 1 or less 6

Add the numerators, keep the denominator: 3/8 + 2/8 The sheet the page opens on, with thirds, fourths, fifths, sixths and eighths. Both fractions count parts of the same size, so only the numerators are added: 3/8 + 2/8 = 5/8. Every sum stays under 1, and the key prints each answer as it falls, so 2/8 + 4/8 = 6/8 is left as 6/8.
Add, then write the sum in lowest terms: 1/6 + 3/6 Every sum on this sheet has a common factor to divide out, and the key prints the factor: 1/6 + 3/6 = 4/6 = 2/3, top and bottom divided by 2. Neither standards text asks for lowest terms, so this is a sheet to choose, not one to require.
Fifths, sevenths and elevenths: sums that cannot be simplified 5, 7 and 11 are prime, and a sum under 1 has a numerator smaller than its denominator, so no answer on this sheet has a common factor: 2/7 + 3/7 = 5/7. Use it when the only step you want marked is the adding.

Show all 16 sheet types (13 more)

Add, sums of 1 or less, continued

Sums in boxes: thirds, fourths, sixths and eighths The same adding with only the four denominators a class meets first, each sum in a box of its own. 1/6 + 4/6 = 5/6: the sixths stay sixths.
Tenths and twelfths: 3/10 + 4/10 The same sums with the two largest denominators grade 4 uses, where the numerators run up to 11: 3/10 + 4/10 = 7/10 and 5/12 + 6/12 = 11/12. Answers are left as they fall.
Two fractions that make 1 whole: 3/8 + 5/8 Each pair fills the whole exactly, and the key shows why: 3/8 + 5/8 = 8/8 = 1. A numerator equal to its denominator is one whole, the idea every sum past 1 leans on.

Sums past 1 4

An improper fraction plus a fraction: 7/4 + 2/4 The first number is already more than 1. The rule does not change: 7/4 + 2/4 = 9/4 = 2 1/4. The key prints the sum as an improper fraction and then as a mixed number, or as a whole number when it comes out even.
Sums past 1, left as improper fractions: 5/8 + 6/8 The numerators are added exactly as before, and the answer is allowed to pass 1: 5/8 + 6/8 = 11/8. Nothing is turned into a mixed number on this sheet, so the rule stays the one step.
Sums past 1, written as mixed numbers: 4/5 + 3/5 Add, then take out the whole: 4/5 + 3/5 = 7/5 = 1 2/5. The key prints the improper fraction, the mixed number and, where the fraction part has a common factor, its lowest terms.
Three fractions in a row: 2/9 + 4/9 + 5/9 Three numerators, one denominator: 2/9 + 4/9 + 5/9 = 11/9. Some sums stay under 1 and some pass it, and the key leaves each answer as it falls.

Subtract with the same denominator 4

Subtract from an improper fraction: 13/6 − 2/6 The first number is more than 1, and the answer may be too: 13/6 − 2/6 = 11/6 = 1 5/6. An answer under 1 is left as a fraction.
Subtract the numerators: 7/10 − 3/10 Taking away works the same way as adding: the denominator names the size of the part and does not change. 7/10 − 3/10 = 4/10, and the key leaves it as 4/10.
Subtract, then write lowest terms: 7/8 − 3/8 Every difference here has a common factor, and the key names it: 7/8 − 3/8 = 4/8 = 1/2, top and bottom divided by 4.
Take a fraction from 1 whole: 1 − 3/8 The whole has to be renamed in the parts being taken away, and the key prints that line: 1 − 3/8 = 8/8 − 3/8 = 5/8. It is the question behind every problem that asks what fraction is left.

Find the missing fraction 2

How much more to make 1 whole? Each line gives one fraction and asks for the part that completes the whole: 3/10 + 7/10 = 1, because 1 − 3/10 = 7/10. The blank comes first on some lines and second on others.
Missing addend: what goes with 2/9 to make 7/9? One addend is hidden and the sum is given. The pupil finds it by subtracting, and the key prints that subtraction beside the answer: 2/9 + 5/9 = 7/9, because 7/9 − 2/9 = 5/9.

How this list was compiled: The sheet types and the worked examples were written for this page, and every worked example was checked with exact fraction arithmetic by script on 2026-10-01. The rule for adding like quantities (two quarters and three quarters make five quarters) was read the same day at https://en.wikipedia.org/wiki/Fraction . Where the skill sits in school was read that day 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): 4.NF.3a (addition and subtraction of fractions as joining and separating parts referring to the same whole) and the grade 4 footnote that limits denominators to 2, 3, 4, 5, 6, 8, 10, 12 and 100; and in the Texas Essential Knowledge and Skills for Mathematics (https://tea.texas.gov/laws-and-rules/sboe-rules-tac/sboe-tac-currently-effect/ch111a.pdf): grade 4, 4.3(E) (addition and subtraction of fractions with equal denominators). Licence: own work