Class notes 9/13
September 13, 2007Some key ideas from today’s class:
Distance is always positive, so to find the distance between two points on a number line, find their difference, then take the absolute value.
The midpoint is half way between the two end points of a segment. Another way to think of the midpoint is that it is the average of the two endpoints. To find the midpoint on a number line, add the endpoints and divide by two.
Distance: subtract, then absolute value
Midpoint: add, then divide by two
We’ll be using square roots to find distances once we get to two-dimensions tomorrow, so you need to know your squares and square roots. To learn them, start by making a list of numbers and their squares. Look for patterns. Then make flash cards and quiz yourself. Here is a website from which you could download a list of the first hundred square numbers, or more: http://naturalnumbers.org/psquares.html
Check out yesterday’s notes for additional ways to learn and earn extra points and improve your grade.
Are you fascinated by Square Numbers? Here is an address of a website that will tell you more than you ever wanted to know about square numbers: http://mathworld.wolfram.com/SquareNumber.html
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