Adding and Subtracting Fractions with Unlike Denominators

Why can't we directly add fractions with unlike denominators?

• Because the denominators are different

• Because the numerators are different

• Because the fractions are mixed numbers

• Because the fractions are improper

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

• Multiply the fractions

• Add the numerators

• Find a common denominator

• Subtract the denominators

How do you find an equivalent fraction for two-thirds?

• Multiply the numerator and denominator by the same number

• Add the numerator and denominator

• Subtract the numerator from the denominator

• Divide the numerator by the denominator

What is two-thirds equivalent to when the denominator is nine?

• 4/9

• 6/9

• 2/9

• 8/9

What is the equivalent fraction of 4/6?

• 2/3

• 1/2

• 3/4

• 5/6

What do we call fractions that have the same denominator?

• Improper fractions

• Mixed numbers

• Common denominators

• Equivalent fractions

When adding fractions with common denominators, what do you do with the denominators?

• Subtract them

• Keep them the same

• Multiply them

• Add them together

What is the sum of 1/9 and 6/9?

• 1/3

• 7/9

• 8/9

• 2/3

Why do we keep the denominator the same when adding fractions with common denominators?

• Because the fractions are improper

• Because the numerator changes

• Because the number of parts in one whole does not change

• Because it is easier

Where can you watch more episodes like this one?

• coolmath.com

• generationgenius.com

• mathisfun.com

• khanacademy.org