Common Denominators and Fraction Operations

Add 1/4 + 3/4. What is the result?

• 3

• 2

• 5/4

• 1

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

Subtract 5/8 - 1/8. What is the result?

• 4/8

• 6/8

• 3/8

• 2/8

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

If you have fractions with denominators 4 and 6, what is the least common denominator?

• 8

• 12

• 10

• 15

Simplify the fraction 6/8 after adding 1/8.

• 7/8

• 3/4

• 8/6

• 5/8

Tags

CCSS.4.NF.A.1

CCSS.5.NF.B.5B

How do you find the lowest common denominator for fractions?

• Find the greatest common factor (GCF) of the denominators

• Subtract the denominators

• Add the numerators together

• Find the lowest common multiple (LCM) of the denominators.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Subtract 1/12 from 10/12, then SIMPLIFY the fraction after (be careful!).

• 11/12

• 9/12

• 2/12

• 3/4

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

If you have fractions with denominators 3 and 5, what is the lowest common denominator?

• 12

• 15

• 8

• 10

Add 2/3 + 1/5 by first finding a common denominator (use pen and paper).

• 7/9

• 3/8

• 13/15

• 19/15

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Subtract 7/10 - 2/5 by first finding a common denominator.

• 1/2

• 3/5

• 5/7

• 3/10

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Which of the following best describes a common denominator?

• The smallest number into which all denominators can be divided without a remainder

• The highest number that divides into each of the denominators without leaving a remainder

• A number that represents the sum of all denominators in a set of fractions

• A number that all the denominators of a set of fractions can divide into evenly