Adding and Subtracting Fractions with Common Denominator

When the denominators are not the same, I must find a...

• common numerator

• common denominator

• equivalent fraction

• mixed number

When adding or subtracting fractions, I NEVER add or subtract the...

• numerators

• denominators

• mixed numbers

• equivalent fractions

Subtraction:
Find Lowest Common Denominator & solve :
5    2/8   -   1    1/6 =

• 4     2/24

• 4     3/18

• 4    7/12

• 4    3/12

Once I have completed adding or subtracting fractions, I should always ____________ if possible.

• make equivalent fractions

• add again

• simplify

• multiply

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

Solve and simplify to lowest terms.

• a

• b

• c

• d

Solve.

• 5/8

• 23/40

• 21/40

• 1/2

• 13/15
• 1 7/12
• 1
• 9/15