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 Blank

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