## Pre Algebra Section 1.1 Lessons and review

This section asks you to understand place value and the names of large numbers.

Here are Narrated Powerpoints -- they've got sound. Please, if you see or hear mistakes or something you'd like changed, click on "comment" and say so :)

How do I Find the Place Value of a Digit?

Naming Small Numbers -- the homework doesn't include any problems like this. If you already know the names of numbers less than a thousand, you can skip it :)

Naming Large Numbers - one group at a time.

This show will review the names of the big groups (thousands, millions, billions and trillions) but if naming 243,001,308,000,121 seems intimidating, start here.

Naming Large Numbers -- all mixed up! Numbers up to the trillions for you to name in words and digits -- how to do it, and practice.

## Section 1.2 - Integers

Introduction to Integers: how can you add something... and end up with less? This little story introduces the idea of the "opposite" nature of integers. http://www.resourceroom.net/math/722IntroIntegers/722IntroIntegers.html

Adding integers of the same sign -- this is via Camtasia, with quizzes interspersed in the video. (You can push the little "play" thing along and get past the quizzes, though.)

Absolute Value -- how can you be absolutely positive about absolute value? A visual-kinesthetic approach can help :)

Adding integers with different signs -- lesson with practice and review of adding same-signed integers

More Powerpoint Shows:

Subtracting Integers - adding the *opposite* :)

Subtracting positive integers from negative integers --

and, finally...

Subtracting Negative Integers -- taking away a bad thing is giving you a good thing!

Distributive property review -- flash movie