integers and rational numbers positive and negative numbers, opposites, and absolute value
TRANSCRIPT
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Integers and Rational Numbers
Positive and Negative Numbers, Opposites, and Absolute Value
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What are positive numbers?
A positive number is a number greater than zero. On a number line, positive numbers are located to the right of zero (on a vertical number line, positive numbers are located above zero).
Positive numbers do not need a sign, but you
may see them written with a “+” in front of them.
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What are negative numbers?
A negative number is a number less than zero. On a number line, negative numbers are located to the left of zero (or on a vertical number line, negative numbers are located below zero). A
negative number will have a “ - ” in front of it.
Ex: -9
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Example of a number line showing positive and negative numbers
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What About Zero?
Zero is neither positive nor negative.
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What are Opposites?
Every negative number is paired with a positive number. The numbers in the pair are the same distance from zero but in opposite directions on a number line. These number pairs are called opposites.Ex: -3 and 3 are opposites
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Opposites (cont.)
Can you name another pair of numbers that are opposites?
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What are integers?
Whole numbers and their opposites have a special name—integers. Integers are “counting numbers” and their opposites.
Some examples of integers are:-4, -3, -2, -1, 0, 1, 2, 3, 4
Zero is an integer, but it is not positive nor negative.
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Where do fractions fit in?
Fractions also have opposites. For example, ½ and -1/2 are opposites.
Positive and negative integers, as well as fractions, are called rational numbers.
Rational numbers are numbers that can be expressed as one integer divided by another integer.
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What is Absolute Value?
Absolute value is the distance of a number from zero on a number line. A distance cannot be negative, so absolute value will always be a positive number. To show absolute value, a number will be written between two bars as shown below:
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Absolute Value (cont.)
Opposites have the same absolute value. Can you name two numbers that have the same absolute value?