Free worksheets · Grade 4
Adding Fractions with Like Denominators Worksheet
Add the numerators, keep the denominator, and write the answer in lowest terms.
Free printable
Adding Fractions with Like Denominators
15 questions, one page, US Letter. Print it and do it on paper.
On the sheet: Add the numerators. Keep the denominator the same. Write the answer in lowest terms: divide the top and the bottom by any number that goes into both.
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About this worksheet
When two fractions have the same denominator, their pieces are the same size, so adding them is counting pieces: 2 fifths and 1 fifth make 3 fifths.
The denominator names the size of the pieces, so it stays the same. Then check whether the answer can be written in lowest terms: 5/10 + 3/10 = 8/10, which is 4/5.
A worked example
3/8 + 1/8 = ?
- Both fractions are in eighths, so add the numerators: 3 + 1 = 4.
- Keep the denominator: 4/8.
- 4 and 8 can both be divided by 4: 4/8 = 1/2.
Answer: 3/8 + 1/8 = 1/2
The common mistake
What it looks like: Adding the denominators too: 3/8 + 1/8 = 4/16.
Why it happens: Adding across the top and the bottom looks like doing the same thing to both parts.
How to fix it: The denominator is the size of the pieces, and eighths added to eighths are still eighths. Only the numerators are added.
Ten minutes a day, on paper. We plan what comes next.
A printed page and a pencil. No screen, no login for your child. Snap a photo when they’re done: AI scores it, and what they missed comes back on the sheets that follow.
- Mon Adding Fractions with Like Denominators
- Tue What they missed, back again
- Wed The next step, when they’re ready
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