Common Denominators for Adding and Subtracting Fractions

When adding or subtracting fractions with unlike denominators, what is the first step?

• Add the numerators

• Add the denominators

• Find a common denominator

When adding and subtracting fractions, what needs to be the same?

• the numerator

• the denominator

• nothing

• everything

What is the bottom number of a fraction called?

• numerator

• factor

• denominator

• sum

When adding fractions with like denominators, the denominators....

• stay the same

• are added together

1/2 - 2/7 =

• 3/4

• 3/7

• 2/14

• 3/14

What is the sum of 2/5 and 3/10?

• 4/10

• 1/2

• 5/10

• 7/10

What is the sum of 3/10 and 3/5? 

• 8/10

• 9/10

• 7/10

• 11/10

What is the sum of 1/4 and 1/3?

• 3/7

• 7/12

• 9/12

• 5/12

5/6 - 1/3 =

• 1/2

• 1/3

• 1/6

• 1/12

What is the value of 3/20 + 3/4?

• 9/20

• 9/10

• 9/24

• 9/80