Directed Numbers
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Questions and Answers

What is represented by a plus sign (+) or no sign at all?

  • Zero
  • Negative numbers
  • Positive numbers (correct)
  • Directed numbers
  • What happens when you add two positive numbers with the same sign?

  • You multiply the numbers and make the result negative
  • You divide the numbers and keep the sign
  • You subtract the smaller number from the larger number
  • You add the numbers and keep the sign (correct)
  • What is the result of multiplying two numbers with different signs?

  • The result is always positive
  • The result is always negative (correct)
  • The result is always zero
  • The result depends on the numbers being multiplied
  • What happens when you subtract a negative number from a positive number?

    <p>You add the numbers and keep the sign of the first number</p> Signup and view all the answers

    What is the result of dividing a positive number by a negative number?

    <p>The result is always negative</p> Signup and view all the answers

    What is represented by a zero?

    <p>Neither positive nor negative</p> Signup and view all the answers

    Study Notes

    Directed Numbers

    Directed numbers are a way to represent integers with a direction or sign.

    Key Concepts:

    • Positive numbers: Numbers greater than zero, represented by a plus sign (+) or no sign at all. Examples: +5, 3
    • Negative numbers: Numbers less than zero, represented by a minus sign (-). Examples: -2, -10
    • Zero: The number that is neither positive nor negative, represented by 0

    Operations with Directed Numbers:

    • Addition:
      • Same signs: Add the numbers and keep the sign. Example: (+3) + (+2) = +5
      • Different signs: Subtract the smaller number from the larger number and keep the sign of the larger number. Example: (+3) + (-2) = +1
    • Subtraction:
      • Same signs: Subtract the smaller number from the larger number and keep the sign. Example: (+5) - (+2) = +3
      • Different signs: Add the numbers and keep the sign of the first number. Example: (+3) - (-2) = +5
    • Multiplication:
      • Same signs: Multiply the numbers and keep the sign. Example: (+2) × (+3) = +6
      • Different signs: Multiply the numbers and make the result negative. Example: (+2) × (-3) = -6
    • Division:
      • Same signs: Divide the numbers and keep the sign. Example: (+6) ÷ (+2) = +3
      • Different signs: Divide the numbers and make the result negative. Example: (+6) ÷ (-2) = -3

    Directed Numbers

    • Directed numbers are used to represent integers with a direction or sign.

    Key Concepts

    • Positive numbers are greater than zero, represented by a plus sign (+) or no sign at all, e.g., +5, 3.
    • Negative numbers are less than zero, represented by a minus sign (-), e.g., -2, -10.
    • Zero is neither positive nor negative, represented by 0.

    Operations with Directed Numbers

    Addition

    • When adding numbers with the same sign, add the numbers and keep the sign, e.g., (+3) + (+2) = +5.
    • When adding numbers with different signs, subtract the smaller number from the larger number and keep the sign of the larger number, e.g., (+3) + (-2) = +1.

    Subtraction

    • When subtracting numbers with the same sign, subtract the smaller number from the larger number and keep the sign, e.g., (+5) - (+2) = +3.
    • When subtracting numbers with different signs, add the numbers and keep the sign of the first number, e.g., (+3) - (-2) = +5.

    Multiplication

    • When multiplying numbers with the same sign, multiply the numbers and keep the sign, e.g., (+2) × (+3) = +6.
    • When multiplying numbers with different signs, multiply the numbers and make the result negative, e.g., (+2) × (-3) = -6.

    Division

    • When dividing numbers with the same sign, divide the numbers and keep the sign, e.g., (+6) ÷ (+2) = +3.
    • When dividing numbers with different signs, divide the numbers and make the result negative, e.g., (+6) ÷ (-2) = -3.

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    Description

    Understand directed numbers, including positive numbers, negative numbers and zero, and how to perform operations with them.

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