Numbers, Data, and Problem Solving Lesson 1.1. Sets of Numbers Natural Numbers The counting numbers...
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Transcript of Numbers, Data, and Problem Solving Lesson 1.1. Sets of Numbers Natural Numbers The counting numbers...
Numbers, Data, and Problem Solving
Lesson 1.1
Sets of Numbers
Natural Numbers The counting numbers
{ 1, 2, 3, 4, … } The whole numbers
The counting numbers with zero included{ 0, 1, 2, 3, 4, … }
The integers The whole numbers and their additive opposites,
their negatives{ . . . , -4, -3, -2, -1, 0, 1, 2, 3, 4, … }
Sets of Numbers
Rational numbers Any number expressed as the quotient of two
integers – and the denominator is NOT zero
Irrational numbers Numbers that cannot be represented by quotient of
two integers
where p and q Integers, and q 0p
q
2 sin 37e
Note: these can be written as terminating or
repeating decimals
Note: these can be written as terminating or
repeating decimals
Try it Out …
Classify the following numbers as Natural numbers Whole numbers Rationals Irrationals
17
3
17
5280
3.14
Order of Operations
Work from innermost parentheses, out
1. Evaluate all exponents
2. Multiplications, divisions from left to right
3. Additions and subtractions from left to right
210 64 2(4 5)
5 3
3
13 9 16
5 7
Calculating Percent Change
If a quantity changes from c1 to c2 the percent of change is given by:
Gasoline changed from $1.19 to $1.43 in one week's time … what was the percent of increase?
2 1
1
100c c
c
Calculating Percent Change
What if you are told the percentage of increase and the original value … now find the new value!
Enter the values you know Solve for the value you don't know
What if gas was at $1.47 and went down by 12% a week later. What is the new price?
2 1
1
100c c
c
What kinds of numbers did we use in these
calculations?
What kinds of numbers did we use in these
calculations?
Problem Solving
Important strategies … Draw a sketch Write formulas involved Determine values in the formulas that you know Solve for the values you are searching for
The Milky Way has a diameter of 6 x 1017 miles. If the speed of light is 186,000 miles/sec, how many years does it take for light to travel across the galaxy?
Assignment
Lesson 1.1 Page 10 Exercises
1 – 27 odd, 77 - 87odd