Subtracting Mixed Numbers with Different Denominators

When adding and subtracting fractions, which value needs to be the same in all values being added/subtracted?

• Numerator

• Denominator

What is the process of making two fractions with unlike denominators able to be added or subtracted called?

• Finding the least common multiple or least common denominator

• Addition

• Multiplication

• Reverse multiplication

6½ - 2⅔

• 4  1/6

• 3  5/6

• 4  1/2

• 3  1/2

8  2/4 - 3  2/3=
Simplify/Reduce if needed.

• 5  2/12

• 4  5/6

• 11  1/6

• 8  2/3

6  2/4 - 2  2/5=
Simplify/Reduce if needed.

• 5  2/7

• 4  2/20

• 6  1/2

• 4  1/10

What must you do first in order to add or subtract fractions with unlike denominators?

• add the numerators

• add the denominators

• find a common denominator

• find a common numerator

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

•   3/4

•  1/21

•    1/24 

•   3/24

Subtraction:
Find Lowest Common Denominator & solve
8    6/9    -    3    2/5  =

• 6

• 4

• 5   12/45

• 5   4/60

Solve

• 8 1/4

• 7 3/4

• 7

• 7 1/4

When fractions have a different denominator, you have to find the ____________ in order to add them together.

• Least Common Denominator

• Greatest Common Factor

• Numerator

• Mixed Number