If the signs of both numbers are alike, (both positive or both negative) add the two numbers and...

INTEGERS: adding, subtracting,

multiplying, and dividing

If the signs of both numbers are alike, (both positive or both negative) add the two numbers and keep the same sign as in the original problem.

Example: -4 + -8 = -12 Example: 5 + 8 = 13

ADDING LIKE SIGN INTEGERS

If the signs are different, (one sign is positive and one sign is negative) subtract the two numbers without the signs and keep the sign of the number farthest from zero.

Example: -10 + 4 = Example: 14+ -18 = Example: -7 + 12 = Example: 14 + -3 = Example: -4 + 4 =

Adding Unlike Sign Integers

You practice:

1. Change subtraction sign to addition. 2. Change the sign of the second integer to

the opposite sign. (If it is negative, make it positive.)

3. Follow addition rules. Example: -5 – 12 = Example: -10 - -13 = Example: 13 – 17 = Example: -11 - -11 =

Subtracting Integers

You practice:

Multiplying Integersand Dividing Integers

1. Multiply or divide the two numbers. 2. If both signs are positive, make answer positive. 3. If both signs are negative, make answers positive.Example: -3 · -6 =Example: -7(-4) =Example: (3)(4) =Example: (-9)(0) =

Example: -40 ÷ -10 = Example: -30/-3 = Example: 14/2 =

Multiplying or dividing like sign integers

Multiply or divide the two numbers. Because one of the numbers is positive and one

of the numbers is negative the answer will be negative.

Example: -8(4)= Example: 7 · -3 = Example: (-2)(6) =

Example: -28 ÷ 7 = Example: 20/-4 = Example: -45/ 9 =

Multiplying or Dividing Unlike Signs

You practice:

1. (-8)(-3) =2. -42/-6 =3. 9(-6) =4. -14/-2 =5. (0)(-14) =6. 20/-4 =

Multiplication/Division Practice

1. -8 + 14 = 2. 24 - -6 =3. -8 (-7) = 4. -7 + -11 = 5. -13 - -19 = 6. 24/-4 =7. -30 + 12 =8. -45 - -45 =9. (-3)(-6) = 10. -6 – 4 =

Practice the following 10 problems and have Mrs. Jennings check them: