Adding and Subtracting Rational Numbers

−28+(−8)=

• 36
• −36
• −20
• 20

Which one of the following is the correct way to write 15 - (-21) into an addition problem?

• 15 + 21

• 15 + (-21)

• -15 + (-21)

• 15 - 21

What is -7 + 10

• 3

• -3

• 17

• -17

What is 6 + (-8)

• -2

• 2

• 14

• -14

What is -2 - 5

• -3

• 3

• 7

• -7

What is -3 + (-3)

• 0

• 6

• -6

• -9

What is 10 - ( -2)

• 12

• 8

• -12

• -8

If the temperature in Chicago is -5 degrees and the temperature in Moscow is 8 degrees colder. What is the temperature in Moscow?

• -3 degrees
• -13 degrees
• 3 degrees
• 13 degrees

When adding decimals with the same sign you.....

• subtract and take the sign of the larger number
• add the opposite
• add and keep the sign
• subtract and keep the sign

When adding decimals with different signs you....

• subtract and take the sign of the larger number
• add the opposite
• add and keep the sign
• subtract and keep the sign