Adding Subtracting Mixed Numbers Unlike Denominators Regrouping

Once I have completed adding or subtracting fractions, I should always ____________ if possible.

• make equivalent fractions

• add again

• simplify

• multiply

Add the mixed numbers vertically. Simplify if needed.

What math equation is being represented in the picture?

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

What is the least common denominator of 1/4 and 1/3?

• 4

• 3

• 12

• 8

• 1 4/5

• 26/20

• 4/5

• 13/10

• 34/24

• 1 5/12

• 17/12

• 1 10/24

• 1 5/8

• 3 1/8

• 2 5/8

• 21/8

Lily jumped rope for 1 1/3 of an hour on Monday and 3/5 of an hour on Tuesday. How much time did Lily jump rope?

• 1 2/5 hours

• 1 3/15 hours

• 1 14/15 hours

• 1 1/2 hours