# Homework Hints 4-2

### Note: Homework Hints are given only for the Level 1 and Level 2 problems.

However, as you go through the book be sure you look at all the examples in the text. If you need hints for the Level 3 problems, check some sources for help on the internet (see the LINKS for that particular section. As a last resort, you can call the author at (707) 829-0606.
On the other hand, the problems designated “Problem Solving” generally require techniques that do not have textbook examples.  There are many sources for homework help on the internet.

Algebra.help
Here is a site where technology meets mathematics. You can search a particular topic or choose lessons, calculators, worksheets for extra practice or other resources.
http://www.algebrahelp.com/

Dr. Math is a registered trademark. This is an excellent site at which you can search to see if your question has been previously asked, or you can send your question directly to Dr. Math to receive an answer.
http://mathforum.org/dr.math/
Quick Math
This site provides online graphing calculators. This is especially useful if you do not have your own calculator.
http://www.quickmath.com/

The Math Forum @ Drexel
This site provides an internet mathematics library that can help if you need extra help. For additional homework help at this site, click one of the links in the right-hand column.
http://mathforum.org/

Problems 1-8
These problems are making sure you understand the idea of explaining what a number means by writing it is expanded notation.
Problems 9-14
See Example 1. (Yes, you are supposed to draw a picture showing the meaning of each of these).
Problems 15-30
See Example 3; these problems are really dealing with order of operations (from Chapter 1). You need to be able to do these before you can understand expanded notation.
Problems 31-42
Write the numbers in expanded notation. See Examples 2 and 4.
Problems 43-48
An abacus is a physical way of representing a number in expanded form. Read the directions for these problems carefully, and look at the example in Figure 4.3.
Problems 49-56
These problems reverse the process you did in Problems 43-48. Look at the example in Figure 4.2.
Problems 50-57
These problems reverse the process you did in Problems 44-49. Look at the example in Figure 4.3.