Adding Fractions with Different Denominators

What is the first step in adding fractions with different denominators?

• Add the numerators directly.

• Find a common denominator.

• Subtract the denominators.

• Multiply the numerators.

How do you find a common denominator for three fractions?

• Subtract the denominators.

• Add the denominators.

• Divide the denominators.

• Multiply the denominators.

What is the common denominator used in the first example?

• 120

• 30

• 60

• 90

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

• Subtract the denominators.

• Add the numerators.

• Multiply by the denominators of the other fractions.

• Multiply by 1.

In the new example, what is the common denominator found?

• 120

• 180

• 240

• 300

What is the purpose of multiplying the fractions by the denominators of the other fractions?

• To change the numerators.

• To ensure all fractions have the same denominator.

• To find the least common multiple.

• To simplify the fractions.

What is the result of adding the numerators in the new example?

• 226

• 240

• 113

• 120

How can you simplify a fraction?

• Multiply the numerator by 2.

• Subtract the denominator from the numerator.

• Add the numerator and denominator.

• Divide both by their greatest common divisor.

What is the simplified form of 226/240?

• 113/120

• 113/240

• 226/120

• 113/60

Why can't 113/120 be reduced further?

• 120 is not divisible by 2 or 3.

• 120 is a prime number.

• 113 is a prime number.

• 113 is not divisible by 2 or 3.