Adding and Subtracting Fractions with Unlike Denominators

5/10 + 8/5

• 5/9

• 1/10

• 2 1/10

• 2 2/10

3/5 - 5/10

• 1/10

• 8/5

• 1/5

• 8/0

Pick the steps that are true

• find the common denominators, add or subtract, change the numerators

• multiply the denominators, add or subtract the numerators, simplify, divide the fraction

• Find the least common denominators, what you do to the top do to the bottom, add or subtract, simplify

• add or subtract, simplify, multiply denominators

Solve: 4/18 + 2/9

• 4/9

• 8/18

• 4/18

• 8/9

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 number could be a common denominator for these three fractions?
1/2   and   1/3   and   1/4

• 9

• 8

• 12

• 6

What is 8/9 - 5/6?

• 1/18

• 3/4

• 6/7

• 10/12

(2/5 + 1/5) - 3/10

• 3/5

• 3/10

• 6/20

• 5/10

What number could be a common denominator for these two fractions?
1/5   and   5/6?

• 30

• 11

• 6

• 5

1/4 + 3/8 =

• 5/8

• 3/8

• 4/12

• 4/8