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# Prerequisite Materials for PGEOG 250

PGEOG 250 assumes proficiency in the topics listed below. If you need a review of this material, read the model problems for the topic and then answer the corresponding practice exercises. Make sure to check your answers. If you have problems with any of these and need assistance, check for the hours that the Dolciani Math Learning Center is open for support in advance of or at the beginning of the semester.

#### The brush-up materials for PGEOG 250 are in two parts:

**(1) T****he PDFs below include brush-up skills on selected topics.**

Combining Rational Expressions

Comparing and Ordering Fractions, Mixed Numbers and Decimals

Converting Between Fractions, Decimals and Percents

Converting Units of Measurment

Introduction to Exponents and Logrithms

Numbers in Scientific Notation

Raising Positive Decimals Smaller than One to Nonnegative Integer Exponents

Recognizing Some Functions and Their Graphs

Solving Linear Equations

Solving Problems Involving Percents

Using Functional Notation

Working with Complex Fractions

Working with Decimals

Working with Integers

Working with Fractions

Working with Formulas

Working with Exponents

Working With Proportions

Working with Rational Numbers

**(2) The multi-media materials in the Dolciani Math Center encompass reviews and practice problems on all of the prerequisite skills necessary to be successful in your course.**

**Come to the Dolciani Math Center in the 7th floor of the library, receive a brief orientation and then you are set to use these materials either in the Center or at home.**