Adding and Subtracting Fractions with Unlike Denominators - Worksheet 10 - 5th Grade

Hard

Add and subtract fractions with unlike denominators (Hard)

23 problems · 20-30 minutes · Skills: fractions, addition, subtraction

About This Worksheet

This hard-level worksheet contains 23 problems designed for 5th Grade students practicing adding and subtracting fractions with unlike denominators. Hard worksheets feature challenging problems including multi-step questions, missing values, and real-world applications to push students further.

Adding and subtracting fractions with unlike denominators is one of the most significant computational milestones in elementary mathematics. It requires combining equivalent fraction understanding, factor knowledge, and arithmetic — and it is used in measurement, cooking, and data analysis.

  • Find the least common denominator (LCD) for two fractions
  • Rewrite fractions as equivalent fractions with the LCD
  • Add and subtract fractions and mixed numbers with unlike denominators
  • Simplify results to lowest terms
  • Solve word problems requiring addition and subtraction of unlike fractions

How to Solve: Worked Example

Example Problem: Solve the first problem on the worksheet.
Solution Steps:
  1. Read the problem carefully.
  2. Identify what is being asked.
  3. Use what you know to find the answer.
  4. Check your work.
Answer: See the answer key below
Tip: Take your time and read each problem carefully before answering!
1
19 + 19 =
2
7 + 9 =
3
11 + 9 =
4
18 + 3 =
5
6 + 12 =
6
13 + 18 =
7
20 + 7 =
8
19 + 17 =
9
8 + 19 =
10
6 + 11 =
11
5 + 6 =
12
14 + 18 =
13
14 + 7 =
14
10 + 9 =
15
14 + 16 =
16
20 + 11 =
17
3 + 3 =
18
9 + 10 =
19
6 + 9 =
20
15 + 13 =
21
10 + 18 =
22
11 + 1 =
23
15 + 12 =

Answer Key

1. 382. 163. 204. 215. 186. 317. 278. 369. 2710. 1711. 1112. 3213. 2114. 1915. 3016. 3117. 618. 1919. 1520. 2821. 2822. 1223. 27

Frequently Asked Questions

How do I download this adding and subtracting fractions with unlike denominators - worksheet 10 worksheet?

Click the "Download PDF / Print" button at the top of the worksheet. You can save it as a PDF or print it directly. The answer key will be on a separate page.

How do I find worksheets at different difficulty levels?

Each subtopic has 10 worksheets: Worksheets 1-3 are Easy, 4-7 are Medium, and 8-10 are Hard. Start with Easy worksheets to build confidence, then progress to harder ones.

What skills does this fractions worksheet cover?

This worksheet focuses on fractions, addition, subtraction. It is designed for 5th Grade students and provides structured practice through varied problem types with a worked example to guide students before they begin.

Can I use this worksheet in my classroom?

Yes. All worksheets on K12Worksheets are free for classroom use. You can print copies for your entire class. With 10 worksheets per subtopic at three difficulty levels, you have plenty of options for differentiated instruction and individualized practice.

How many problems are on this worksheet?

This worksheet contains 23 problems. It typically takes 20-30 minutes to complete. An answer key with all solutions is included so parents and teachers can check work quickly.