Add and Subtract Positive and Negative Integers on a Number Line

5. (-8) + (4) = ?

• -4

• 4

• -12

• 12

8. (-8) - (-4) = ?

• -4

• 4

• -12

• 12

(8) - (4) = ?

• -4

• 4

• -12

• 12

(-12) - (-8) = ?

• 4

• -4

• 20

• -20

14. (-12) + (8) = ?

• 4

• -4

• 20

• -20

15. (12) + (-8) = ?

• 4

• -4

• 20

• -20

17. (39) + (-12) + (-27) = ?

• 15

• -15

• 0

• 68

adding integers with DIFFERENT signs

• subtract their absolute value; keep the sign of the integer with the higher absolute value

• add their absolute value and keep the sign of the integers

• change subtraction sign (between the integers) to an addition sign and change the sign of the integer following it to its opposite (if it was positive, make it negative; if it was negative, make it positive); then solve

What number is missing in the equation modeled by the number line? -2 + _______ = -7

• 5

• 7

• -5

• -7

What number was added to 4 for the model to end on -2?

• -6

• 6

• -4

• 4