Adding and Subtracting Rational Numbers

-38 - 29

• -67

• 67

• 9

• -9

-4 + (-3) = ?

-5 + 9 = ?

8 + (-2) = ?

Bob lost 5 bonus points on page one of his math test and he gained 9 points bonus on page two of his math test. Which equation best describes Bob progress on his math test?

• 5 + 9 = 14

• -5 + 9 = 4

• -5 + (-9) = -14

• 5 + (-9) = -4

-10 + 10 =

-23.4 - 3.4= 

• -20

• 26.8

• -26.8

• 20

7.19 + (-5.34)

• 12.53

• -1.85

• -12.53

• 1.85

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

Rewrite the problem as addition.

-5.66 - (-4.1)

• 5.66 + (-4.1)

• -5.66 + 4.1

• -5.66 + (-4.1)

• -5.66 - 4.1