Adding and Subtracting Fractions with Related Denominators

In order to add or subtract fractions, they must have:

• Different denominators.

• A common denominator.

• The same numerator.

• No numerators.

What is the result of adding 3/4 and 2/5 when written with a common denominator of 20?

• 17/20

• 14/20

• 11/20

• 5/20

The common denominator between 7/8 and 2/4 is:

• 4

• 16

• 8

• 12

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

• Numerator

• Denominator

What is the sum of these fractions in lowest terms?

• 7/18

• 7/9

• 12/9

• 12/81

What is the sum of these fractions in lowest terms?

• 5/12

• 5/24

• 6/12

• 6/144

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

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 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