Adding and Subtracting Unlike Fractions

Adding and Subtracting Unlike Fractions

by Sara McCullough

Poll

The Greatest Common Factor helps to ______________.

• Find a common denominator

• Simplify

Poll

The Least Common Multiple helps to ______________.

• Find a common denominator

• Simplify

Multiple Choice

Simplify the fraction $$\frac{9}{15}$$  

• $$\frac{3}{4}$$  

• $$\frac{3}{5}$$  

• $$\frac{2}{3}$$  

• $$\frac{3}{6}$$  

Multiple Choice

True or False: If you add 2 different fractions, the denominators do not have to be the same.

• TRUE

• FALSE

​What is the common denominator in the addition problem?

​What is the common denominator in the addition problem?

Multiple Choice

Find the sum

• $$\frac{1}{4}$$  

• $$1\ \frac{1}{4}$$  

• $$\frac{2}{4}$$  

• $$\frac{1}{8}$$  

Multiple Choice

Do you still have to have common denominators to subtract fraction?

• YES!

• NO!

​Let's look at a subtraction example:

Multiple Choice

• $$\frac{2}{2}$$  

• $$\frac{2}{4}$$  

• $$\frac{1}{4}$$  

• $$\frac{1}{2}$$