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INTEGERS: adding, subtracting, multiplying, and dividingPowerPoint Presentation

INTEGERS: adding, subtracting, multiplying, and dividing

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### INTEGERS: adding, subtracting, multiplying, and dividing

### Multiplying Integersand Dividing Integers

ADDING LIKE SIGN INTEGERS

- 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 Unlike 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 =

Subtracting Integers

- 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 =

Multiplying or dividing like sign 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 Unlike Signs

- 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 =

Multiplication/Division Practice

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

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

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 =

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