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Integers and their opposites

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Basics on the topic Integers and their opposites

Learn about integers and their opposites. What are integers and their opposites? Using the number line that has both positive and negative numbers, we can find the integer and its opposite.

Transcript Integers and their opposites

"Hey Kai, what's under that cover?" "That button is very tempting!" "Go on Kai, you should totally push it." "Oh, that goes without saying, June!" Welcome to the Integer Universe! To make it back to your universe, you will need to win the game by using integers and their opposites. Buckle up and pay close attention to the tutorial! An integer is any whole number. The opposite of an integer is a number that is the same distance from a set point on a number line. This is called equidistant. Take a look at this number line. Going left from zero are the negative integers and going right from zero are the positive integers. Zero is a special case here, since it is neither positive nor negative, which makes zero its own opposite! To find the opposite of an integer, you always move in the opposite direction from zero the same number of values. If we move two places to the right from zero we end up on two. To find the opposite, we must move two places to the left from zero to end up on minus-two. In this case, the opposite of two is minus two! Now, you probably noticed we counted the same value from zero both ways, two. This is what is known as the absolute value. The absolute value of two and minus two is two since we moved the same distance from zero each time. Absolute value is the integer's distance from zero, whether it is a positive integer or a negative integer. That concludes the tutorial, get ready to play! Level one, begin! Find the opposite integer of seven! The opposite must be equidistant, or equal distance, from zero, so we count seven values to the left of the zero, (...) which is minus-seven. The opposite of seven is minus seven. Now find the opposite integer of minus-eleven! The opposite must be equidistant from zero, so we count eleven values to the right of the zero, which is eleven. The opposite of minus eleven is eleven. Level one complete! Level two, begin! Find the opposite of six, and name the absolute value! The opposite of six is minus-six. Since we counted six values either direction from zero both times, the absolute value is six. Now find the opposite of minus-ten, and name the absolute value! The opposite of minus-ten is ten. Since we counted ten values either direction from zero, the absolute value is ten. For a bonus, in this problem, what is the opposite of the opposite? Since the opposite of minus-ten is ten, the opposite of the opposite is the original value, minus-ten. Phew! You won the game, but before you return, let's summarise. All integers have a positive value and a negative value, except for zero. Zero is neither positive or negative and is its own opposite. The opposite of any integer is equidistant from zero on a number line. The distance positive and negative integers are from zero is known as the absolute value. "Woah. I feel very negative about that experience!" "Well I'm absolutely positive that we shouldn't do that again. Let's cover it back up Kai!"

Integers and their opposites exercise

Would you like to apply the knowledge you’ve learnt? You can review and practice it with the tasks for the video Integers and their opposites.
  • Connect the terms and definitions.

    Hints

    1, -1, 2, -2 and so on are all integers.

    1.5, -1.5, 2.75, -2.75 are NOT integers.

    What is the difference in these groups of numbers?

    5, 6,10, and 20 are all positive integers.
    -5, -6, -10, and -20 are all negative integers.

    The absolute value of 10 and -10 is 10.
    The absolute value of 25 and -25 is 25.
    The absolute value of 42 and - 42 is 42.
    What is the definition of absolute value?

    Solution
    • Two or more things that are the same distance from a set point are equidistant.
    • Another name for a whole number is integer.
    • Whole numbers with a positive value more than zero are positive integers.
    • Whole numbers with a negative value less than zero are negative integers.
    • The distance from an integer to zero on a number line is the integer's absolute value.
  • Identify the true sentences.

    Hints

    The absolute value is the distance from an integer to zero on a number line.
    Example: The absolute value of 10 and -10 is 10.

    Both 10 and -10 are integers.
    10.5 and -12.6 are NOT.

    -12 and 12 are opposite integers.
    They are both 12 away from zero on a number line.

    There are 3 correct choices and 2 false.

    Solution

    True

    • All integers have a positive or negative value except for zero.
    • The opposite of any integer is equidistant from zero on a number line.
    • Both positive and negative integers have an absolute value.
    False
    • All integers have a positive value.
    • Only positive integers have an absolute value.

  • Find opposite integers.

    Hints

    The opposite of any integer is equidistant from zero on a number line.

    Integers are whole numbers.

    There are 2 correct choices.

    Solution

    Correct
    These are opposite integers.

    • 10 and -10 (shown above)
    • 15 and -15
    Incorrect
    • 5, -10 are not equidistant from zero.
    • 20, 20 are the same number and cannot be opposites.
    • -17, 7 are not equidistant from zero.
    • 2.5, -2.5 are not whole numbers and therefore not integers.

  • Find the opposite integer and absolute value.

    Hints

    The opposite of any integer is equidistant from zero on a number line.

    The absolute value is the distance from an integer to zero on a number line.
    Example: The absolute value of 10 and -10 is 10.

    If an integer is positive, its opposite integer must be negative.
    If an integer is negative, its opposite integer must be positive.

    Solution

    5
    The opposite integer is -5 because this is equidistant from zero on the number line.
    The absolute value is 5 because this is the distance from zero.

    17
    The opposite integer is -17 because this is equidistant from zero on the number line.
    The absolute value is 17 because this is the distance from zero.

    -99
    The opposite integer is 99 because this is equidistant from zero on the number line.
    The absolute value is 99 because this is the distance from zero.

    -22
    The opposite integer is 22 because this is equidistant from zero on the number line.
    The absolute value is 22 because this is the distance from zero.

  • Find the absolute value.

    Hints

    Absolute value is a number's distance from zero on a number line.

    Both negative and positive numbers will have the same absolute value if they are opposite.
    Example: 20, and -20 have the same absolute value which is 20.

    Use this number line to help you.

    Solution

    The absolute value of 5 and -5 is 5.
    This is because they are both 5 away from zero on the number line.

  • Determine the opposite integer and absolute value.

    Hints

    If an integer is positive, its opposite integer must be negative.
    If an integer is negative, its opposite integer must be positive.

    The absolute value is the distance from an integer to zero on a number line.
    Example: The absolute value of 10 and -10 is 10

    The opposite of any integer is equidistant from zero on a number line.

    Solution

    43
    The opposite integer is - 43 because this is equidistant from zero on the number line.
    The absolute value is 43 because this is the distance from zero.

    - 5
    The opposite integer is 5 because this is equidistant from zero on the number line.
    The absolute value is 5 because because this is the distance from zero.

    38
    The opposite integer is - 38 because this is equidistant from zero on the number line.
    The absolute value is 38 because this is the distance from zero.

    - 47
    The opposite integer is 47 because this is equidistant from zero on the number line.
    The absolute value is 47 because this is the distance from zero.