# Elementary technical mathematics by Dale Ewen, C. Robert Nelson

By Dale Ewen, C. Robert Nelson

Effortless TECHNICAL arithmetic 11th variation is written to aid scholars with minimum math heritage effectively organize for technical, exchange, allied well-being, or Tech Prep courses. The authors concentrate on primary thoughts in uncomplicated mathematics together with the metric approach and size, algebra, geometry, trigonometry, and facts, that are supported by means of hundreds of thousands of examples, routines, and functions surrounding such fields as commercial and development trades, electronics, agriculture/horticulture, allied well-being, CAD/drafting, HVAC, welding, auto/diesel carrier, aviation, ordinary assets, culinary arts, business/personal finance, and others. For this revision, the authors have further over a hundred and fifty new workouts, 30 new examples, new purposes different types, and a brand new appendix on uncomplicated inequalities. The objective of simple TECHNICAL arithmetic is to have interaction scholars and supply them with the maths heritage they should reach destiny classes and careers.

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Additional info for Elementary technical mathematics

Example text

It does not change the value of the fraction. ■ Example 2 Multiply: 18 7 * . 25 27 As a shortcut, divide a numerator by 9 and a denominator by 9. Then multiply: 2 18 7 2#7 14 * = = 25 27 25 # 3 75 ■ 3 Any mixed number must be replaced by an equivalent improper fraction before multiplying or dividing two or more fractions. Copyright 2009 Cengage Learning, Inc. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. 46 Chapter 1 ■ Basic Concepts Example 3 3 Multiply: 8 * 3 .

Subtract the fractions, then subtract the whole numbers and simplify. Example 14 2 3 Subtract: 8 from 13 . 3 4 3 9 = 13 4 12 2 8 8 = 8 3 12 13 5 First change the proper fractions to the LCD, 12. 1 12 ■ If the larger of the two mixed numbers does not also have the larger proper fraction, borrow 1 from the whole number. Then add it to the proper fraction before subtracting. Copyright 2009 Cengage Learning, Inc. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. 38 Chapter 1 ■ Basic Concepts Example 15 3 1 Subtract: 2 from 4 .

15 in. 18. The replacement cost for construction of the building in Illustration 4 is \$90/ft2. Determine how much insurance should be carried for full replacement. 5 in. 75 ft 5 in. 40 ft 44 ft 16 ft 40 in. 6 in. 12 ft 24. 8 ft 20 ft 8 ft 12 ft 24 ft 26 ft ILLUSTRATION 4 20 ft 15 ft 60 ft Copyright 2009 Cengage Learning, Inc. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. 4 25. Find the volume of a rectangular box 10 cm by 12 cm by 5 cm. 26. A mountain cabin has a single room 20 ft by 10 ft by 8 ft high.