Adding and Subtracting Rational Numbers

Whole Numbers

100

4-(-10)

14

200

-23 + (-14)

-37

300

What is the opposite of these numbers?

a. 4

b. -10

c. 107

d. -29

a. -4

b. 10

c. -107

d. 29

400

Lily is collecting donations for a charity event.

• On Monday, she collected 42 dollars.
• On Tuesday, she collected 57 dollars.
• On Wednesday, she had to spend 18 dollars to buy some supplies for the event.
• On Thursday, she collected 34 dollars.

How much money does Lily have after Thursday?

$115

Decimals

100

Simplify the expression: (-13.2) + 8.1

-5.1

200

-22.44 + (-12.21)

-34.65

300

What expressions are equal to (-24.5) + 16.15 - 4?

a. 24.5 - 16.15 + 4

b. 16.15 - 28.5

c. 12.15 - 24.5

d. -20.5 + 16.5

b. 16.15 - 28.5

c. 12.15 - 24.5

400

A scuba diving instructor takes a group of students to a depth of 54.96 feet. Then they ascend 22.38 feet to see some fish. Where are the fish in relation to the surface?

32.58 feet below the surface, or -32.58 feet

Fractions

100

-(1/4) + 4/5

11/20

200

How would you subtract a negative fraction from a positive decimal? 

Convert both answers into decimal or fraction form, then add the opposite of the negative number.

300

Draw out a number line that represents the expression 9/10 + (-1 3/10)

Number line

400

Jon recorded a temperature of 62 degrees this morning for science class. The temperature increased 6 1/2 degrees in the afternoon and decreased 8.7 degrees in the evening. What was the evening temperature?

59.8 degrees