Comprehensive and easy to use, the revised and updated seventh edition covers practical math problems that automotive technicians will face on the job. The easy-to-read and well organized chapters of Practical Problems in Mathematics for Automotive Technicians, Seventh Edition feature step-by-step instructions, diagrams, charts, and examples that facilitate the problem-solving process while reinforcing key concepts. The presentation builds from the basics of whole-number operations to cover percentages, linear measurement, ratios, and the use of more advanced formulas. With a special section on graphs, scale reading of test meters, and invoices found in the workplace, this text is tailor-made for students in any automotive course of study!

### Table of Contents

Preface

Estimation

SECTION 1 WHOLE NUMBERS

Unit 1 Addition of Whole Numbers

Unit 2 Subtraction of Whole Numbers

Unit 3 Multiplication of Whole Numbers

Unit 4 Division of Whole Numbers

SECTION 2 COMMON FRACTIONS

Unit 5 Addition of Common Fractions

Unit 6 Subtraction of Common Fractions

Unit 7 Multiplication of Common Fraction

Unit 8 Division of Common Fractions

SECTION 3 DECIMAL FRACTIONS

Unit 9 Fractional Equivalents

Unit 10 Addition of Decimal Fractions

Unit 11 Subtraction of Decimal Fractions

Unit 12 Multiplication of Decimal Fractions

Unit 13 Division of Decimal Fractions

Unit 14 Micrometer Reading: Application of Decimal Fractions

Unit 15 Multiple Operations of Common and Decimal Fractions

SECTION 4 PERCENT AND PERCENTAGE

Unit 16 Simple Percent

Unit 17 Simple Percentage

Unit 18 Discounts

Unit 19 Profit and Loss, Commissions

Unit 20 Interest and Taxes

Unit 21 Percent of Error and Averages

SECTION 5 MEASUREMENT

Unit 22 English Linear Measurements

Unit 23 Metric Measurements

Unit 24 Scale Reading

Unit 25 Scale Reading of Test Meters

Unit 26 Circular Measurements

Unit 27 Angular Measurements

Unit 28 Area and Volume Measurement

Unit 29 Time, Speed, and Money Calculations

SECTION 6 RATIO AND PROPORTION

Unit 30 Ratios

Unit 31 Proportions

SECTION 7 FORMULAS

Unit 32 Formulas for Circular Measurement

Unit 33 Formulas for Efficiency

Unit 34 Temperature

Unit 35 Cylindrical Volume Measurements

Unit 36 Horsepower

Unit 37 Ohmâ€™s Law

SECTION 8 GRAPHS

Unit 38 Use of Graphs

SECTION 9 INVOICES

Unit 39 Repair Orders and Shop Tickets

Appendix

Glossary

Answers to Odd-Numbered Problems