Add and Subtract Fractions & Mixed Numbers Like Denominators

Add and Subtract Fractions & Mixed Numbers Like Denominators

Adding Fractions with like Denominators

• Add the numerators

• Keep the denominators the same

What is a like denominator?

A like denominator is a denominator that is the same. This means that the whole has been divided up into the same number of parts.

Multiple Choice

Do the fractions  $\frac{2}{5}$  and  $\frac{1}{5}$  have like denominators

• yes

• no

Multiple Choice

 $\frac{3}{7}$  +  $\frac{2}{7}$  =

•  $\frac{5}{14}$  

•  $\frac{5}{7}$  

•  $\frac{1}{7}$  

Multiple Choice

 $\frac{1}{8}$  + $\frac{3}{8}$  Simplify 

•  $\frac{4}{16}$  

•  $\frac{2}{8}$  

•  $\frac{1}{2}$  

• Answer not here

Let's watch a video from Math Antics

https://www.youtube.com/watch?v=pynfj2bYRms&feature=youtu.be

Do they both have fractions?

No. Then you just have to add the whole numbers together and the fraction remains the same. The answer is 6 $\frac{1}{8}$  
 

Multiple Choice

Maria's class recycled 2 $\frac{2}{8}$ boxes of paper in a month. If they recycled another 10 $\frac{4}{8}$ boxes the next month. What is the total amount they recycled?

• 12 $\frac{6}{16}$  

• 12 $\frac{2}{8}$  

• 10 $\frac{1}{2}$  

• 12 $\frac{3}{4}$  

Subtracting Fractions with like Denominators

• Subtract the numerators

• Keep the denominators the same

Brandon spent 8 $\frac{2}{5}$ hours working on his writing and math homework last week. If he spent 2 $\frac{4}{5}$ hours on his writing homework, how much time did he spend on his math homework?

• First write the mixed numbers on top of each other.

• Determine the operation (+,-, x, or  $\div$  )

Multiple Choice

2   $\frac{3}{8}$  -  $\frac{5}{8}$  = ?

• 2  $\frac{2}{8}$  

• 3

• 1  $\frac{3}{4}$  

• 2  $\frac{1}{4}$