Adding and Subtracting Common Fractions

What do you need to have when adding unlike fractions

• common denominator

• common numerator

• common numerator and denominator

• common fractions

• 1
• 3
• 9
• 8

What is ALWAYS required when adding/subtracting fractions?

• The same numerators.

• The same denominators.

• Equivalent fractions.

• Add the numerators (top parts of the fractions).

• Rewrite the fractions in the simplest form. 

• Rewrite the fractions with a common denominator. 

• Make each fraction into an improper faction. 

Find the sum.

• 7/18

• 7/9

• 12/9

• 12/81

What is the sum of these fractions in lowest terms?

What equation is shown here?

• 2/10 + 6/10 = 8/10

• 6/10 - 4/10 = 2/10

• 2/10 + 4/10 = 6/10

• 0+ 2/10 = 6/10

What is the sum of these fractions in lowest terms?

• 7/18

• 7/9

• 12/9

• 12/81

What is the sum of these fractions in lowest terms?

• 4/5

• 3/20

• 17/20

• 4/20

What equation is shown on the number line?

• 1/5 + 3/5 = 4/5

• 4/5 - 1/5 = 3/5

• 1/5 + 4/5 = 5/5

• 4/5 - 3/5 = 1/5