Adding and Subtracting Fractions Common Denominators

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

• common numerator

• common denominator

• equivalent fraction

• mixed number

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

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

• numerators

• denominators

• mixed numbers

• equivalent fractions

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

• make equivalent fractions

• add again

• simplify

• multiply

What is the sum of these fractions in lowest terms?

• 5/12

• 5/24

• 6/12

• 6/144

• apple

• 1

What is the sum of these fractions in lowest terms?

• 7/18

• 7/9

• 12/9

• 12/81

Solve.

• 5/8

• 23/40

• 21/40

• 1/2

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

• Numerator

• Denominator