Adding & Subtracting Signed Fractions

Like Fractions

Unlike Fractions

Changing Unlike to Like denominator

• Find a common multiple that will go into both denominators.

Multiple Choice

What is the least common denominator of 

$$\frac{1}{4}$$  and  $$\frac{2}{5}$$  

• 5

• 25

• 10

• 20

Multiple Choice

What is the least common denominator of 

$$\frac{6}{8}$$  and  $$\frac{4}{12}$$   

• 12

• 24

• 8

• 16

Multiple Choice

$$\frac{9}{10}-\frac{3}{4}$$  

• 5/7

• 3/20

• 3/8 

• 9/10

Multiple Choice

To put a fraction in simplest form, you will need to do this to the numerator and denominator

• subtract both by same number

• divide both by the same number

• add the same number to both

• multiply both by the same number

Multiple Choice

Reduce:  6/15

• 2/5

• 3/5

• 4/9

Multiple Choice

$$\frac{2}{6}+\frac{1}{2}$$  

• 5/6

• 3/6

• 4/6

• 3/8

Multiple Choice

7/10 - 1/2 = _____
in simplest form

• 2/10

• 1/5

• 6/10

• 8/2

​Use the same rules as integers.

Fill in the Blanks

When adding rational numbers with the same sign, add the numbers and

the sign.

Multiple Choice

When adding rational numbers with different signs, find the _________________ and keep the sign of the number with the larger absolute value.

• sum

• difference

• product

• quotient

Multiple Choice

$$Solve:\ \ \ \ -\frac{7}{8}\ +\ \frac{1}{4}$$  

• $$\frac{9}{8}$$  

• $$\frac{5}{8}$$  

• $$\frac{6}{12}$$  

• $$-\frac{5}{8}$$  

Multiple Choice

Solve and Simplify

-1/4 - (-2/3)

• -5/12

• 5/12

• -11/12

• 11/12

​Math Sprint! Solve as many as you can in 3 minutes

​-1/2 + (-2/3)

​

​-5/6 + 1/4

​

​3/4 + (-5/6)

​

​1/2 - (-2/5)

​

​-3/7 - (-1/2)

​

​-1/3 - (- 2/6)

​Math Sprint! Review your answers

​-1/2 + (-2/3) = -1 2/3

​

​-5/6 + 1/4 = -7/12

​

​3/4 + (-5/6) = -1/12

​

​1/2 - (-2/5) = 9/10

​

​-3/7 - (-1/2) = 1/14

​

​-1/3 - (- 2/6) = 0