Marie shared 1/4 of a cake with a friend. Her sister shared 3/8 of a cake with her friends. The problem asks how many total slices of cake they shared and who shared more. Students are instructed to work in groups to solve the problem and add or subtract fractions. Examples are provided of adding, subtracting, and solving for variables involving fractions. Steps for adding or subtracting dissimilar fractions are outlined. Students are given practice problems to apply their skills.

4. 1 and 1
6 3
1 and 2
8 3
2 and 1
3 2
2 and 3
3 4
2 and 1
5 3

5. Analyze the problem.
Marie shared ¼ slice of a cake to her friend.
Her sister shared 3/8 slice of a cake with her
friends. How many slices of cake did they
share altogether? Who shared more cake?

6. Group the children into five working
teams. Work cooperatively in finding
the answer to the problem.

7. Explore and Discover
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8. Add or subtract the following.
1. 5 + 1= 2. 3 + 2= 3. 6 _ 1=
8 3 4 3 9 5
4. 4 _ 1= 5. 6 _ 8= 6. 5 + 2=
5 2 8 3 9 3

9. Add or subtract the following.
1. 5 + 1= 2. 3 + 1= 3. 6 _ 2=
8 2 4 3 9 3
4. 5 _ 1= 5. 3 _ 1= 6. 9 + 2=
6 4 5 2 10 5

10. Solve for n.
1. 3 + 1= 2. 5 + 1= 3. 2 _ 1=
5 2 6 3 3 4
4. 3 _ 4= 5. 7 _ 1= 6. 5 + 1=
10 5 8 3 6 3

11. To add or subtract dissimilar fractions.
1. Look for the LCM or LCD of the fractions.
2. Change the dissimilar fractions to similar
fractions.
3. Add or subtract the fractions.
4. Reduce the answer to lowest term if needed.

12. Apply your skills!

13. A. Add the following.
1. 3 + 1= 2. 2 + 1= 3. 4 _ 1=
4 2 6 3 5 4
B. Subtract the following.
4. 2 _ 1= 5. 5 _ 1=
4 2 9 3

14. A. Add the following.
1. 1 + 2= 2. 3 + 1=
2 3 4 2
B. Subtract the following.
3. 3 _ 1= 4. 4 _ 1=
4 2 5 3