Add or Subtract Fractions with Denominators

When the denominators are not the same, I must find a...

• common numerator

• common denominator

• equivalent fraction

• mixed number

Once I have completed adding or subtracting fractions, I should always ____________ if possible.

• make equivalent fractions

• add again

• simplify

• multiply

Solve.

• 5/8

• 23/40

• 21/40

• 1/2

Solve and simplify to lowest terms.

• a

• b

• c

• d

Review: What is 1/10 + 5/10?

Review: What is 1/10 less than 5/10?

Landon has 8/10 of his lawn left to mow. He mows 6/10 of the lawn before breaking for breakfast. How much more of the lawn does Landon have left to mow?

Kirk has 3/4 of a carton of eggs. He uses some of the eggs to make an omelette and now has 2/4 of the carton left. What fraction of the carton did Kirk use?

How confident are you in your ability to add or subtract fractions with like denominators?

• 4

• 3

• 2

• 1

Match the following differences

• 1/10

• 4/5 - 4/5 =

• 1/3

• 2/3 - 1/3 =

• 4/9

• 8/9 - 4/9 =

• 3/10

• 4/10 - 1/10 =

• 0/5

• 8/10 - 7/10 =