Adding Fractions with Different Denominators

Why is it necessary to find a common denominator when adding fractions?

• To make the numerators equal

• To simplify the fractions

• To ensure the fractions have the same base for addition

• To convert fractions to decimals

What is the least common multiple (LCM) of the numbers 5, 4, and 2?

• 10

• 15

• 20

• 25

How do you convert a fraction to have a new denominator?

• Multiply both the numerator and denominator by the same number

• Divide both the numerator and denominator by the same number

• Add the same number to both the numerator and denominator

• Subtract the same number from both the numerator and denominator

What is the result of adding the fractions 8/20, 15/20, and 10/20?

• 33/20

• 30/20

• 20/20

• 25/20

How can you express 33/20 as a mixed number?

• 1 13/20

• 2 13/20

• 1 10/20

• 2 10/20