Adding and Subtracting Fractions with Like Denominators

Lesson Learners

100

What did we learn about Yesterday?

Least common denominators

200

What is the Least Common Multiple of 4 and 10?

20

300

What is the Least Common Multiple of 3 and 4?

12

400

What is the least common multiple of 15 and 20?

60

500

What is the least common multiple of 5, 15, and 60?

60

Word Wise

100

What are like fractions?

What are fractions with the same denominator.

200

What are unlike fractions?

What is when the fractions have different denominators.

300

What does sum mean?

What is to add.

400

What does difference mean?

What is to subtract.

500

When 9/16 and 5/16 are added together, do they equal 7/8? Explain your reasoning.

What is yes, because 9/16 + 5/16 = 14/16, when 14/16 is reduced to simplest form, it is equal to 7/8.

Super Sums

100

What is 3/5 + 1/5?

What is 4/5.

200

What is 2/7 + 1/7?

What is 3/7.

300

What is 3/4 + 3/4?

What is 6/4 or 1 2/4 or 1 1/2.

400

What is 4/5 + 3/5?

What is 7/5 or 1 2/5.

500

What is 7/9 + 4/9 - 1/9

What is 10/9 or 1 1/9

Delightful Differences

100

What is 3/8 - 1/8?

What is 2/8 or 1/4.

200

What is 4/5 - 1/5?

What is 3/5.

300

What is 12/15 - 2/15? In simplest form?

What is 10/15 or 2/3.

400

During lunch recess, Ms. Day and Ms. Law decided to have a race. Ms. Day ran 13/18 of a mile, and Ms. Law ran 7/18 of a mile. How much farther did Ms. Day run than Ms. Law?

What is 5/18 or 1/3 of a mile.

500

On Monday through Saturday, it rained 3/8 inches. On Sunday, the total rainfall for the week was 7/8 inches. How much rain fell on Sunday alone?

What is 4/8 or 1/2 inches.

Challenge Accepted

100

In November, all the leaves were falling off the trees and making a huge mess. Vince worked 1/4 hour one day raking the leaves on his front lawn. He worked 3/4 hours the next day. How many hours did Vince slave away raking leaves on his lawn?

What is 4/4 hours, or 1 hour.

200

Rosario helped her mother with the laundry. She did 1/8 of it on Monday and 3/8 of it on Tuesday. What fraction of the laundry had she done?

What is 4/8 or 1/2 of the laundry.

300

John went to the Sacramento Railroad Museum to see model trains. He saw 2/5 mile of track on the first floor of the museum. He saw 4/5 mile of track on the second floor. How much more track did John see on the second floor of the museum than the first?

What is 2/5 mile.

400

In Ms. Day's class, the students use the following abbreviations when they chat with their friends online: TTYL- 9/29 IDK- 11/29 CUL8R- 3/29 BRB- 15/29 LOL- 23/29 What fraction of these students use LOL and IDK when chatting online?

What is 23/29 +11/29 =34/29 =1 5/29

500

Robert ate 2/4 of a pizza and Alaina ate 1/2. If their mom eats 1/8 of a pizza how many pizzas would they need so that they would have enough for their dad to eat as well?

What is two pizzas.