Steps
What is the 1st step when solving addition and subtraction problems with unlike denominators?
Find a common denominator.
1/4 + 2/6
7/12
3/5 - 1/7 =
16/35
8/9 - 3/10 =
53/90
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.
What is the 2nd step when adding/subtracting fractions with unlike denominators?
Find equivalent fractions using the new denominator.
5/6 - 1/4 =
7/12
2/4 + 3/9 =
5/6
12/20 + 10/15 =
76/60 or 1 4/15
A bowl of Ms. Calegans favorite cereal has 2/3 cup of oats and 2/8 cup of raisins. How many MORE cups of oats than raisins are there in the bowl.
10/24 more
What is the 3rd step when adding and subtracting fractions with unlike denominators?
Add or subtract the numerators.
2/5 - 1/6 =
7/30
5/10 - 1/3 =
1/6
8/20 - 3/15 =
1/5
Kimberly is making a quilt for her sister. She finished 1/4 of the quilt the first week. 2/6 the second week. Then 2/8 the third week. Write a numerical expression to show how much is completed this far with a common denominator of 24.
Also solve.
6/24 + 8/24 + 6/24
20/24
What is the 4th step when adding and subtracting fractions with unlike denominators?
Change improper fractions to mixed numbers.
4/5- 3/8 =
17/40
10/15 + 3/9 =
1
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
What is the 4th step when adding and subtracting fractions with unlike denominators?
Simplify.
20/40 + 30/60 =
1
8/12 + 17/20 =
91/60 or 1 31/60
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