Adding Fractions With Unlike Denominators (Video Lesson) 4th

Why do we need a common denominator when adding fractions?

• To make the denominators the same

• To make the fractions easier to read

• To ensure the fractions have the same value

• To make the numerators the same

What is the least common multiple (LCM) of 9 and 3?

• 27

• 3

• 9

• 18

How do you rename 1/3 to have a denominator of 9?

• Add 6 to the numerator

• Multiply both the numerator and denominator by 3

• Subtract 2 from the denominator

• Multiply both the numerator and denominator by 2

What is the least common multiple (LCM) of 10 and 6?

• 20

• 30

• 40

• 50

What is the sum of 3/10 and 2/6 when expressed with a common denominator?

• 19/30

• 9/30

• 10/30

• 30/30