Adding and Subtracting Fractions and Mixed Numbers

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

What number could be a common denominator for these two fractions?

1/5 and 5/6?

• 30

• 11

• 6

• 5

7/8 - 3/4

• 2/8

• 4/8

• 1/8

2/3 - 1/2

• 1/6

• 1/5

• 5/6

What is 8/9 - 5/6?

• 1/18

• 3/4

• 6/7

What is a Mixed Number?

• A fraction with no whole number.

• A fraction with only a whole number.

• A fraction with a whole number and a fraction.

• A fraction where the top number is bigger than the bottom.