integers and absolute value section 2-1. intro to integers an integer is the set of whole numbers...
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Integers and Absolute Value
Section 2-1
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Intro to Integers
• An integer is the set of whole numbers and their opposites, including zero, represented by {… -3, - 2, - 1, 0, 1, 2, 3,…}
• A positive integer is a whole number greater than zero.
• A negative integer is w whole number less than zero.
• Website for Integer Rules
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Things to remember
• Graph – means to draw a point on the number line to represent the integer.
• Zero is neither positive nor negative.• Absolute value refers to the distance
away from zero an integer is. (ALWAYS positive!)
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How do I know if it is positive or negative?
• Reference to zero.• Ask yourself, “Is it good, did it help?” • Look for key words:
–Negative: below, loss, withdraw, less than, etc…
–Positive: above, profit, deposit, more than, etc…
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Absolute Value• Key points for absolute value:
–Always positive because it refers to distance from zero, not position on the number line.
–Treat them like ( ). Solve the inside, then take the absolute value.
–Simply remove the sign, keep the number!
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Practice!
19
91410
81315
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Comparing and Ordering Integers
Section 2-2
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How to read the signs• < (less than)• > (greater than)
• Example 1: 4 < 8 4 is less than 8
• Example 2: – 5 > – 16 negative 5 is greater than
negative 16
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Ordering Integers
• WARNING! graph or picture where the negative numbers fall on a number line.
• *It may be easier to think, “is this negative number MORE negative that one?”
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True or False! Why?
1919
159
7815
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Homework
• Worksheet–Practice 2-2, All–Skills Practice, Even