**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.

**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/

**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/