Printable worksheet for practicing adding fractions with like denominators, ideal for 3rd-grade math students.

To add fractions that have the same bottom number (denominator), you just need to follow these two simple steps:

1. Add the top numbers (numerators) together.
2. Keep the bottom number (denominator) exactly the same. Do not add the bottom numbers.

Let's solve each problem on the sheet one by one using this rule.

1) $\frac{5}{8} + \frac{1}{8}$
* Add tops: $5 + 1 = 6$
* Keep bottom: $8$
* Result: $\frac{6}{8}$

2) $\frac{4}{10} + \frac{4}{10}$
* Add tops: $4 + 4 = 8$
* Keep bottom: $10$
* Result: $\frac{8}{10}$

3) $\frac{3}{7} + \frac{2}{7}$
* Add tops: $3 + 2 = 5$
* Keep bottom: $7$
* Result: $\frac{5}{7}$

4) $\frac{4}{3} + \frac{1}{3}$
* Add tops: $4 + 1 = 5$
* Keep bottom: $3$
* Result: $\frac{5}{3}$

5) $\frac{5}{9} + \frac{3}{9}$
* Add tops: $5 + 3 = 8$
* Keep bottom: $9$
* Result: $\frac{8}{9}$

6) $\frac{3}{4} + \frac{2}{4}$
* Add tops: $3 + 2 = 5$
* Keep bottom: $4$
* Result: $\frac{5}{4}$

7) $\frac{4}{12} + \frac{7}{12}$
* Add tops: $4 + 7 = 11$
* Keep bottom: $12$
* Result: $\frac{11}{12}$

8) $\frac{4}{5} + \frac{3}{5}$
* Add tops: $4 + 3 = 7$
* Keep bottom: $5$
* Result: $\frac{7}{5}$

9) $\frac{3}{6} + \frac{7}{6}$
* Add tops: $3 + 7 = 10$
* Keep bottom: $6$
* Result: $\frac{10}{6}$

10) $\frac{4}{9} + \frac{8}{9}$
* Add tops: $4 + 8 = 12$
* Keep bottom: $9$
* Result: $\frac{12}{9}$

11) $\frac{6}{10} + \frac{3}{10}$
* Add tops: $6 + 3 = 9$
* Keep bottom: $10$
* Result: $\frac{9}{10}$

12) $\frac{5}{7} + \frac{6}{7}$
* Add tops: $5 + 6 = 11$
* Keep bottom: $7$
* Result: $\frac{11}{7}$

13) $\frac{4}{5} + \frac{3}{5}$
* Add tops: $4 + 3 = 7$
* Keep bottom: $5$
* Result: $\frac{7}{5}$

14) $\frac{4}{11} + \frac{5}{11}$
* Add tops: $4 + 5 = 9$
* Keep bottom: $11$
* Result: $\frac{9}{11}$

15) $\frac{5}{4} + \frac{6}{4}$
* Add tops: $5 + 6 = 11$
* Keep bottom: $4$
* Result: $\frac{11}{4}$

16) $\frac{2}{8} + \frac{5}{8}$
* Add tops: $2 + 5 = 7$
* Keep bottom: $8$
* Result: $\frac{7}{8}$

17) $\frac{2}{11} + \frac{8}{11}$
* Add tops: $2 + 8 = 10$
* Keep bottom: $11$
* Result: $\frac{10}{11}$

18) $\frac{3}{20} + \frac{11}{20}$
* Add tops: $3 + 11 = 14$
* Keep bottom: $20$
* Result: $\frac{14}{20}$

19) $\frac{8}{15} + \frac{9}{15}$
* Add tops: $8 + 9 = 17$
* Keep bottom: $15$
* Result: $\frac{17}{15}$

20) $\frac{21}{50} + \frac{12}{50}$
* Add tops: $21 + 12 = 33$
* Keep bottom: $50$
* Result: $\frac{33}{50}$

Final Answer:
1) 6/8
2) 8/10
3) 5/7
4) 5/3
5) 8/9
6) 5/4
7) 11/12
8) 7/5
9) 10/6
10) 12/9
11) 9/10
12) 11/7
13) 7/5
14) 9/11
15) 11/4
16) 7/8
17) 10/11
18) 14/20
19) 17/15
20) 33/50