Fractions Addition and Subtraction with Unlike Denominators

What is ALWAYS required when adding/subtracting fractions?

• The same numerators.

• The same denominators.

• Equivalent fractions.

What is the correct answer to this fraction addition problem?

What is the the next step to finding this answer?

• Add the numerators (1+1=2)

• Multiply both numerators by 12 .

• Multiply the first numerator by 4 and the second numerator by 3.

• Multiply the first numerator by 3 and the second numerator by 4.

Solve

• 11 3/4

• 11 3/8

• 11

• 3/4

Find Lowest Common Denominator & solve
8     4/5    +    9    1/10  =

• 18   5/15

• 17   5/10

• 17   9/20

• 17   9/10

Subtraction:
Find Lowest Common Denominator & solve
8    5/7    -    7    2/3 = 

•   3/4

•  1/21

•    1/24 

•   3/24

What do you need to have when adding unlike fractions?

• common denominator

• common numerator

• common numerator and denominator

What would be a least common denominator of the following fractions?

• 2

• 6

• 12

• 9

What would be a least common denominator of the following fractions?

• 15

• 10

• 30

• 20