INTEGERS: adding, subtracting, multiplying, and dividing

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# INTEGERS: adding, subtracting, multiplying, and dividing - PowerPoint PPT Presentation

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

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### 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
• 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.)
• Example: -5 – 12 =
• Example: -10 - -13 =
• Example: 13 – 17 =
• Example: -11 - -11 =

### 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 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 =

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 =