By Dale Ewen, C. Robert Nelson

Straight forward Technical arithmetic 10th variation was once written to assist scholars with minimum math history arrange for technical, alternate, allied overall healthiness, or Tech Prep courses. The authors have integrated numerous examples and purposes surrounding such fields as commercial and development trades, electronics, agriculture, allied healthiness, CAD/drafting, HVAC, welding, vehicle diesel mechanic, aviation, usual assets, and others. This variation covers uncomplicated mathematics together with the metric method and dimension, algebra, geometry, trigonometry, and records, all as they're with regards to technical and alternate fields. The target of this article is to interact scholars and supply them with the mathematics history they should reach destiny classes and careers.

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**Example text**

It would not be correct in the examples above to leave 7 # 4, 4 # 7, or 2 # 14 as factors of 28, since 4 and 14 are not prime numbers. ■ Short division, a condensed form of long division, is a helpful way to find prime factors. Find a prime number that divides the given number. Divide, using short division. Then find a second prime number that divides the result. Divide, using short division. Keep repeating this process of stacking the quotients and divisors (as shown below) until the final quotient is also prime.

32 2 1 in. 32 6 1 in. 32 20 2 in. 32 3 5 in. 32 20 2 in. 32 = 1 = = = = = = = 15 Perimeter: 18 9 82 in. = 15 + 2 in. = 17 in. 32 32 16 ■ Using a Calculator to Add and Subtract Fractions Example 21 Add: 2 2 7 . + 3 12 A bc 3 ϩ 7 A bc 12 ϭ 1 1 4 Thus, Example 22 7 1 2 + = 1 . 3 12 4 Add: 7 7 ■ 3 11 + 5 . 4 12 A bc 3 A bc 4 ϩ 5 A bc 11 A bc 12 ϭ 13 2 3 Thus, 7 3 11 2 + 5 = 13 . 4 12 3 ■ Copyright 2009 Cengage Learning, Inc. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part.

70. In tilapia aquaculture production, a feed conversion ratio of 2 lb of high-protein pelleted feed per pound of weight gain, after death losses, is not unusual. At that rate of feed conversion, if fish food costs $520 per ton (2000 lb), what would be the feed cost per pound of live fish produced? 8 ft 10 in. 1 ft 2 in. 2 Order of Operations The expression 53 means to use 5 as a factor 3 times. We say that 53 is the third power of 5, where 5 is called the base and 3 is called the exponent. Here, 53 means 5 ϫ 5 ϫ 5 ϭ 125.