add/subtract fractions

What is 8/9 - 7/9?

• 1/9
• 15/9
• 1   6/9
• 1   2/3

The number on the bottom of a fraction is called what?

• numerator
• denominator

The number on the top of a fraction is called what?

• numerator
• denominator

3/8 + 2/8

• 5/8
• 1/8
• 5/16

5/6 + 1/6

• 6/12
• 6/6 or 1

1/5 + 1/5 + 1/5 

• 2/5
• 1/5
• 3/5

4/5 - 1/5 =

15/20 - 10/20 =

The numerator of a unit fraction is always ______.

• 1

• 2

• 3

• 4

In order to add or subtract fractions, their denominators must be _________.

• the same (common)

• different (uncommon)