Unlike Denominators
Unlike Denominators Challenge
Word Problems
Common Denominators/Models
100
3/5 - 1/7 =
16/35
100
8/9 - 3/10 =
53/90
100
Helena walks 5/8 mi to her friend's house and then 1/4 mi to school. How far does she walk?
7/8 mi.
100
Find two different common denominators that can be used to solve 5/6 - 1/4
12, 24, 36, 48, ...
200
2/4 + 3/9 =
5/6
200
12/20 + 10/15 =
1 4/15
200
Paige spent 1/4 hour exercising and another 3/20 hour shooting baskets. How much more time did she spend exercising?
1/10 hr more
200
What is the hardest natural substance on Earth?
Diamond
300
5/10 - 1/3 =
1/6
300
8/20 - 3/15 =
1/5
300
Who painted the ceiling of the Sistine Chapel?
Michaelangelo
300
Write a pair of equivalent fractions for 4/7 and 1/4 using a common denominator of 28.
16/28 and 7/28
400
4/5- 3/8 =
17/40
400
What is the tallest mountain in North America?
Denali (Mount McKinley)
400
Nico ate 5/8 c of soup. Kolin ate 3/4 c of soup. Who ate more soup? How much more?
Kolin ate more, 1/8 c more
400
Solve 7/8 - 1/3 with a model
13/24
500
What is the capital of Canada?
Ottawa
500
10/15 + 3/9 =
1
500
Mr.Jensen bought 2 3/8 yd of fabric to make a sports coat and 1 1/3 yd of fabric to make a dress shirt. How much fabric did he buy?
3 17/24
500
Solve 2/5 + 1/3 with a model
11/15 
600
2/5 - 1/6 =
7/30
600
8/12 + 17/20 =
1 31/60
600
Solomon weighs 12 1/2 pounds and Maxx weighs 21 1/4 pounds. What is the total weight of both babies?
33 3/4
600
Write a numerical expression to model 3/4 - 1/3 using the common denominator of 24.
18/24 - 8/24