Fractions Models for Adding/Subtracting

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

• make equivalent fractions

• add again

• simplify

• multiply

What is the best common denominator for this problem?

• 6

• 8

• 24

• 48

What is the best common denominator for this problem?

• 5

• 2

• 20

• 10

What is the sum of the fractions represented by the shaded and unshaded parts of the model?

• 3/3 + 5/5 = 2

• 3/8 + 5/8 = 8/8

• 1/2 + 2/6 = 3/8

• 2/8 + 3/8 = 5/8

What subtraction equation with the CORRECT answer could be demonstrated by the models below?

• 2 4/8 - 1/8 = 3/8

• 4/8 - 1/8 = 3/8

• 3 1/8 - 4/8 = 7/8

• 2 1/8 - 5/8 = 1 4/8

What mixed number does the following number sentence represent?

• 1 3/4

• 1 4/4

• 8 3/4

• 1 2/4

Luke worked on his math homework for 4 3/4 hours this week and 2 2/4 hours last week. Which number sentence can be used to find the fraction of hours Luke worked on his math homework these two weeks?

• 19/4 + 10/4 = 29/8

• 19/4 + 10/4 = 29/4

• 3/4 + 2/4 = 5/4

• 3/4 + 2/4 = 5/8

A milk jug contained 7 3/8 ounces of milk left in it. Melissa used 4 5/8 ounces for a recipe. How many ounces are left?

• 3 2/8

• 1 3/8

• 2 6/8

• 4 6/8

Becky ordered an extra-large pizza. She and her family ate 7/12 of the pizza. The next day Becky ate 2/12 of the pizza for lunch. How much of the pizza was left after she ate her lunch?

• 3/12

• 9/12

• 12/12

• 12/35