Adding Fractions - Review

Adding Fractions

Craby: Grade 7

Remember

You must have a common denominator in order to add your fractions.

A common denominator means that you have the same number for your denominators.

Press play to listen to instructions!!

Multiple Choice

Find the lowest common denominator of 1/5 and 2/10.

• 10

• 5

• 50

• 15

Multiple Choice

Which of these numbers could NOT be a common denominator for these two fractions?
2/4   and   3/8

• 32
• 12
• 8
• 24

Multiple Choice

What is the least common denominator of 1/9 and 2/3?

• 6

• 3

• 9

• 21

Multiple Choice

Solve this equation using the least common denominator.

1 / 4 + 1 / 2

• 3/4

• 2/8

• 6/4

• 6/8

Adding Fractions

Once you have a common denominator you have to add the numerators together, and keep your denominator the same.

Multiple Choice

 $\frac{1}{3}\ +\ \frac{2}{9}$  

• 4/9

• 1/4

• 3/12

• 5/9

Multiple Choice

What is the first step in solving this problem? 
4 / 5 + 1 / 2 =

• Add the top parts of the fraction

• Rewrite the fractions in the simplest form. 

• Find a common denominator. 

• Make each fraction into an improper faction. 

Multiple Choice

 $\frac{1}{5}\ +\frac{\ 2}{5}$  

• 3/10

• 3/5

• 2/5

• 2/25

Adding Mixed Number Fractions

When you are adding a mixed number fraction, all you have to do is change them to improper fractions first!

Remeber that you do this by going

3 x 5 = 15

then you add on the 2

15 = 2 = 17

and your bottom number stays the same.

Press play to listen to instructions!

Multiple Choice

Convert  $1\frac{\text{3}}{\text{5}}$  to an improper fraction.

•  $\frac{8}{5\ }$  

•  $\frac{9}{5}$  

•  $\frac{6}{3}$  

•  $\frac{15}{5}$  

Multiple Choice

Convert  $1\frac{\text{6}}{\text{10}}$  to an improper fraction.

•  $\frac{\text{16}}{\text{10}}$  

•  $\frac{\text{17}}{\text{10}}$  

•  $\frac{\text{16}}{\text{6}}$  

•  $\frac{\text{17}}{\text{6}}$  

Multiple Choice

Change to an improper fraction.

• 24/4

• 35/4

• 11/3

• 28/3

Multiple Choice

Change to an improper fraction.

• 11/2

• 21/1

• 21/2

• 20/2

Adding Mixed Number Fractions

Now that you remember how to change mixed number fractions to improper, you can add them.

Remember to change them to improper FIRST, then you can add as we have learned.

Multiple Choice

 $2\ \frac{1}{4}\ \ +\ 3\ \frac{2}{12}$  

• 5 3/4

• 5 5/12

• 5 3/12

• 5 2/4

Multiple Choice

• 5 1/2
• 1 1/6
• 5 5/14
• 4 19/24

Multiple Choice

When adding mixed numbers, what is the first thing you need to do?

• Find the LCD

• Find the GCF

• Add the whole numbers

• Change them to improper fractions

Multiple Choice

 $5\ \frac{1}{2}\ +\ 6\ \frac{1}{3}$  

• $9\ \frac{5}{7}$

• $5\ \frac{2}{3}$

• $10\ \frac{1}{5}$

• $11\ \frac{5}{6}$

Multiple Choice

 $\frac{3}{5\ }\ +\ \frac{1}{4}$  

• $\frac{12}{17}$

• $\frac{17}{20}$

• $\frac{20}{17}$

• $2\ \frac{1}{2}$

Multiple Choice

 $4\ \frac{7}{8}$  +  $\frac{1}{4}$  

• 5
  

•  $5\ \frac{1}{8}$  

•  $5\ \frac{2}{8}$