Adding and Subtracting Fractions with Unlike Denominators

Is this a correct answer?

• Yes, the student correctly added.
• No, you cannot add unlike denominators
• No, 5 + 7 is not 12
• No, 2 + 3 is not 5

The top number of a fraction is called the _________________.

• common factor

• denominator

• numerator

• equivalent fraction

The bottom number of a fraction is called the ______.

• fraction

• multiple

• numerator

• denominator

LCM stands for

• least common denominator

• least common multiple

• common factor

• factor tree

Find the least common multiple of 16 and 24

• 36

• 46

• 48

• 24

Find the least common multiple of 8 and 12

• 16

• 20

• 35

• 24

Find the least common multiple of 13 and 39

• 52

• 39

• 45

• 24

Find the LCM of 4 and 9

• 4

• 9

• 13

• 36

What is the first step in solving this problem? 
⅘ + ½ =

• Add the top parts of the fraction
• Rewrite the fractions in the simplest form. 
• Find a common denominator. 
• Make each fraction into an improper faction.