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 ID: 319936
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Slide1
INTEGERS: adding, subtracting, multiplying, and dividingSlide2
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 INTEGERSSlide3
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 IntegersSlide4
You practice:Slide5
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 IntegersSlide6
You practice:Slide7
Multiplying Integersand Dividing IntegersSlide8
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 integersSlide9
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 SignsSlide10
You practice:Slide11
(-8)(-3) =-42/-6 =
9(-6) =
-14/-2 =
(0)(-14) =
20/-4 =
Multiplication/Division PracticeSlide12
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: