Adding and Subtracting Fractions: Key Concepts and Examples

What is the top number of a fraction called?

• Denominator

• Numerator

• Quotient

• Factor

What do we call denominators that are not the same?

• Like denominators

• Unlike denominators

• Equal denominators

• Similar denominators

What should you check for in the denominators when adding fractions with unlike denominators?

• If the numerators are the same

• If the fractions are mixed numbers

• If one denominator is a factor of the other

• If the fractions are improper

How do you adjust a fraction to have the same denominator as another fraction?

• Multiply by a form of 1

• Divide by a form of 1

• Subtract the denominators

• Add the numerators

What is 3/4 multiplied by 4/4?

• 1

• 7/8

• 12/16

• 3/4

What do you do after making the denominators the same?

• Divide the numerators

• Subtract the numerators

• Add the numerators

• Multiply the numerators

What is 12/16 + 9/16?

• 21/16

• 1 5/16

• 3/4

• 7/8

In the second example, what is the factor relationship between 5 and 15?

• They are both prime

• 15 is a factor of 5

• 5 is a factor of 15

• They have no common factors

What is 3/5 multiplied by 3/3?

• 3/5

• 9/15

• 6/10

• 1

What is the result of adding 9/15 and 4/15?

• 5/15

• 15/15

• 1

• 13/15