Fraction Operations Review - Warm-up

To add or subtract like fractions you

• add or subtract the numerators and the denominators

• cross cancel

• cross multiply

• add or subtract the numerators and keep the denominator the same

To multiply fractions you

• look to see if you can cross cancel then multiply straight across

• use cross products

• multiply the numerators and keep the denominators the same

• flip the second fraction then multipy

To divide fractions you

• change it to multiplication

• cross cancel

• flip the first fraction then multiply

• flip the second fraction then multiply

• 13/3
• 13/27
• 9/39
• 3/13

• 5/6
• 3/15
• 3/8
• 2/15

• 1/6
• 2/12
• 8/9
• 8/12

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