**Problems 1-4**

These problems test your understanding of this section. If you are having trouble answering these question, go back and read the section.

**Problems 5-6**

See Table 4.5; note the people in these problems are like the dots in Table 4.5.

**Problems 7-16**

See Example 1; this step is the first step in changing from a base *b* to a base 10, except leave your answer in expanded form without multiplying out the answer.

**Problems 17-30**

See Example 1. Write each of these numbers in expanded notation.

**Problems 31-36**

See Examples 2 and 3. Use repeated division and read the answer by looking at the remainders.

**Problems 37-58**

See Example 4, and keep in mind changing number bases.

**Problem 37**; hours and days write base 12 base twenty-four to mean one day and two hours.

**Problem 38**; weeks and days write 12 base seven to mean one week and two days.

**Problem 39**: pounds and ounces write 12 base sixteen to mean one pound and two ounces.

**Problem 40**: feet and inches write 12 base twelve to mean one foot and two inches.

**Problem 41**: quarters, nickels, and pennies write 123 base twenty-five to mean one quarter, two nickels, and 3 pennies.

**Problem 42**: gross, dozens, and units write 123 base 12 to mean one gross, two dozen, and 3 units.

The other problems use one of the above named bases.

**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/