Add Subtract Fractions Unlike and Like

Is the problem solved correctly?

• Yes, the student added correctly.

• No, you cannot add unlike denominators

What is the least common denominator you could use to change 1/3 and 1/4 into equivalent fractions?

• 3

• 4

• 24

• 12

What is the first step in solving this problem?

• Add the numerators (top numbers), then add the denominators (bottom numbers).

• Rewrite the fractions in the simplest form.

• Find the common denominator for each fraction, then make equivalent fractions.

• Change each fraction into improper factions.

• 18

• 24 

•   27

• 36 

• 45

What is the sum of these fractions in lowest terms?

• 7/18

• 7/9

• 12/9

• 12/81

What is the sum of these fractions in lowest terms?

• 5/12

• 5/24

• 6/12

• 6/144

Look at the problem. What step is taking place?

• Add the numerators, then add the denominators

• Add the denominators (3 + 4 = 7).

• Simplify the answer

• 2

• 14

• 7

• 28

Carefully following a recipe, Ben used exactly 5/8 of a cup of oil and 3/4 of a cup of water. How many cups of liquid did Ben use in all?

You go out for a long walk. You walk 3/4 mile and then sit down to take a rest. Then you walk 3/8 of a mile. How far did you walk altogether?

• 3/8

• 1/12

• 1 1/8

• 1/2