Adding Fractions With Like And Unlike Denominators

What is the sum of the following equation in lowest terms:
9/12 + 3/12 =

• 10/12

• 1

• 12/12

• 6/12

  How do you add two fractions with like denominators?

• Add the denominators; keep the numerators the same

• Add the numerators and add the denominators

• Add the numerators to the denominators

• Add the numerators and keep the like denominators

When adding or subtracting fractions with unlike denominators, what is the first step?

• Add the numerators

• Add the denominators

• Find a common denominator

When adding and subtracting fractions, what needs to be the same?

• the numerator

• the denominator

• nothing

• everything

When adding fractions with like denominators, the denominators....

• stay the same

• are added together

Adding & Subtracting Fractions with

UNLIKE Denominators

• I'm ready to try

• Let's do this!

• I'm not sure about these.

How can you find a common denominator?

• Add the denominators together

• Pick your favorite number

• Find a common multiple for the two denominators

After changing the denominator, what do you need to do to the numerator?

• Nothing

• Multiply the numerator by the same number as the denominator

• Double it

Solve and simplify to lowest terms

• A

• B

• C

• D

What number could be a common denominator for these two fractions?
2/3   and   3/4

• 3

• 4

• 7

• 12