sections 2.1, 2.2
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Sections 2.1, 2.2
Positive and Negative Numbers
(Part 1)
What are integers?
The whole numbers and their opposites.
…-3, -2, -1, 0, 1, 2, 3…
(Numbers marked on a standard number line.)
Graph the following integers.
-5, -1, 10, 4, -9
Graph the following integers.
-5, -1, 10, 4, -9
What do the following symbols mean?
<, >, =
What Is Absolute Value?
The distance a number is from zero.
Evaluate each expression.
Example 1-4dEvaluate each expression.
5z 10xy
Let x = 3, y = 12, z = -9
4 - you could teach it right now3 – you could ace it on a test2 – you could give an example1 – may of heard of it, but that’s about it
Rules for Adding Integers
Same Signs:
Add the two numbers and use the same sign.
Different Signs:
Subtract the two numbers, use the sign of the number with the larger absolute value.
Evaluate the following expressions.
Same Signs:
Add the two numbers and use the same sign.
Different Signs:
Subtract the two numbers, use the sign of the number with the larger absolute value.
38 + (-23) =
-14 + (-15) =
-35 + (-39) =
-34 + 21 =
Evaluate the following expressions.
Same Signs:
Add the two numbers and use the same sign.
Different Signs:
Subtract the two numbers, use the sign of the number with the larger absolute value.
Homework
Practice 2.1, 2.2 All
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