Adding and Subtracting Integers

-3 - 5 =

• -2

• 2

• 8

• -8

7 - - 8 =

• 15

• -1

• -15

• 1

21 - (+25)

• 4

• 46

• -4

• -46

How do you solve the following equation? - 6 - 7 =

• Like signs: Subtract. the numbers, carry the sign. Answer is -1

• Like signs: Add the numbers, carry the sign. Answer is -13

7 - 21 =

• 28

• -28

• -14

• 14

6 - + 9 =

• 15

• -15

• 3

• -3

How do you solve the following equation? -9 + 12 =

• Unlike signs: Subtract, look at the largest number, pay attention to the sign in front of it. It tells you if the answer is positive or negative. Answer is 3

• Unlike signs: Subtract, look at the largest number, pay attention to the sign in front of it. It tells you if the answer is positive or negative. Answer is -3

• Unlike signs: Add the numbers, look at the largest number, pay attention to the sign in front of it. It tells you if the answer is positive or negative. Answer is 3

What do you do if the equation has two operations (or signs next to each other? Example: -6 + - 6 =

• Put a parenthesis around the sign and number, add the signs, re-write the new equation and solve. Answer: 0

• Put a parenthesis around the sign and number, multiply the signs, re-write the new equation and solve. Answer: 12

• Put a parenthesis around the sign and number, multiply the signs, re-write the new equation and solve. Answer: -12

• Put a parenthesis around the sign and number, add the signs, re-write the new equation and solve. Answer: -12

-3 - - 4 + - 11 =

• -10

• 10

• 4

• -4

8 - + 3 - - 4 + - 6 + 5 =

• 9

• 26

• -8

• 8