Mathematics, Basic Math and Algebra
Transcript of Mathematics, Basic Math and Algebra
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DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
NONRESIDENT
TRAINING COURSE
Mathematics, Basic Math and Algebra
NAVEDTRA 14139
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DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
PREFACE About this course: This is a self-study course. By studying this course, you can improve your professional/military knowledge, as well as prepare for the Navywide advancement-in-rate examination. It contains subject matter supporting day-to-day occupational knowledge and skill requirements and includes text, tables, and illustrations to help you understand the information. Any errata for this course can be found at https://www.advancement.cnet.navy.mil under Products. History of the course: • June 1980: Original edition released. • June 1985: Reprinted. • Apr 2003: Administrative update released. Technical content was not reviewed or revised.
NOTE
In the assignment portion of this course, a question with no answer choices given is a True/False question. For True/False questions, answer 1 for True and 2 for False.
Published by NAVAL EDUCATION AND TRAINING
PROFESSIONAL DEVELOPMENT AND TECHNOLOGY CENTER
https://www.cnet.navy.mil/netpdtc
POINTS OF CONTACT ADDRESS • E-mail: [email protected] • Phone:
Toll free: (877) 264-8583 Comm: (850) 452-1511/1181/1859 DSN: 922-1511/1181/1859 FAX: (850) 452-1370
COMMANDING OFFICER NETPDTC N331 6490 SAUFLEY FIELD ROAD PENSACOLA FL 32559-5000
NAVSUP Logistics Tracking Number 0504-LP-026-7940
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CONTENTS CHAPTER PAGE
1 Number systems and sets ....................................................................................... 1
2 Positive integers ..................................................................................................... 7
3 Signed numbers...................................................................................................... 19
4 Common fractions.................................................................................................. 28
5 Decimals................................................................................................................. 45
6 Percentage and measurement ................................................................................. 55
7 Exponents and radicals........................................................................................... 65
8 Logarithms and the slide rule ................................................................................. 80
9 Fundamentals of algebra ........................................................................................ 98
10 Factoring polynomials............................................................................................ 111
11 Linear equations in one variable ............................................................................ 120
12 Linear equations in two variables........................................................................... 130
13 Ratio, proportion, and variation ............................................................................. 141
14 Dependence, functions, and formulas .................................................................... 151
15 Complex numbers .................................................................................................. 158
16 Quadratic equations in one variable ....................................................................... 167
17 Plane figures........................................................................................................... 181
18 Geometric constructions and solid figures ............................................................. 190
19 Numerical trigonometry ......................................................................................... 199APPENDIX I Squares, cubes, square roots, cube roots, logarithms, and reciprocals of numbers… 210
II Natural sines, cosines, and tangents of angles from 0˚ to 90˚ ................................... 213
III Mathematical symbols............................................................................................... 219
IV Weights and measures ............................................................................................... 220
V Formulas.................................................................................................................... 221
INDEX .............................................................................................................................. INDEX 222 ASSIGNMENT QUESTIONS follow index.
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MATHEMATICS, VOLUME 1
Figure 5-1.–Place values including decimals.
Figure 5-2.–Conversionof a decimal fractionto shortened form.
are zeros in the denominator of the fractionalform.
Figure 5-3 shows the fraction 24358 and100000
what is meant when it is changed to the short-ened form. This figure is presented to showfurther that each digit of a decimal fractionholds a certain position in the digit sequenceand has a particular value.
By the fundamental rule of fractions, it
should be clear that 5 50 500= = . Writing
10 100 1000
the same values in the shortened way, we have0.5 = 0.50 = 0.500. In other words, the value ofa decimal is not changed by annexing zeros atthe right-hand end of the number. This is not
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Figure 5-3.–Steps in the conversion of adecimal fraction to shortened form.
true of whole numbers. Thus, 0.3, 0.30, and0.300 are equal but 3, 30, and 300 are not equal.Also notice that zeros directly after the deci-mal point do change values. Thus 0.3 is notequal to either 0.03 or 0.003.
Decimals such as 0.125 are frequently seen.Although the 0 on the left of the decimal pointis not required, it is often helpful. This is par-ticularlytrue in an expression such as 32 ÷ 0.1.In this expression, the lower dot of the divisionsymbol must not be crowded against the decimalpoint; the 0 serves as an effective spacer. Ifany doubt exists concerning the clarity of anexpression such as .125, it should be written as0.125.
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MATHEMATICS. VOLUME 1
0.2000.0250.002
0.227
Figure 6-1.–(A) Parts of a micrometer;(B) micrometer scales.
of an inch. Multiplying times 0.025 inch, we
find that each marking on the thimble repre-sents 0.001 inch.
0.025 inch since1
is equal to 0.025. The40sleeve has 40 markings to the inch. Thus eachspace between the markings on the sleeve isalso 0.025 inch. Since 4 such spaces are 0.1inch (that is, 4 x 0.025), every fourth mark islabeled in tenths of an inch for convenience inreading. Thus, 4 marks equal 0.1 inch, 8 marksequal 0.2 inch, 12 marks equal 0.3 inch, etc.
To enable measurement of a partial turn,the beveled edge of the thimble is divided into25 equal parts. Thus each marking on the
thimble is1
of a complete turn, or1
of1
25 25 401
25
READING THE MICROMETER
It is sometimes convenient when learning toread a micrometer to writedown the component
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parts of the measurement as read on the scalesand then to add them. For example, in figure6-1 (B) there are two major divisions visible(0.2 inch). One minor division is showingclearly (0.025 inch). The marking on the thimblenearest the horizontal or index line of the sleeveis the second marking (0.002 inch). Addingthese parts, we have
Thus, the reading is 0.227 inch. As explainedpreviously, this is read verbally as "two hun-dred twenty-seven thousandths." A more skill-ful method of reading the scales is to read alldigits as thousandths directly and to do anyadding mentally. Thus, we read the major divi-sion on the scale as “two hundred thousandths”and the minor division is added on mentally.The mental process for the above setting thenwould be “two hundred twenty-five; two hundredtwenty-seven thousandths.”
Practice problems:
1. Read each of the micrometer settings shownin figure 6-2.
Figure 6-2.–Micrometer settings.
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MATHEMATICS, VOLUME 1
The foregoing example could be followedthrough for any distance between markings.Suppose the 0 mark fell seven tenths of the dis-tance between ruler markings. It would takeseven vernier markings, a loss of one-hundredthof an inch each time, to bring the marks in lineat 7 on the vernier.
The vernier principle may be used to getfine linear readings, angular readings, etc.The principle is always the same. The vernierhas one more marking than the number of mark-ings on an equal space of the conventional scaleof the measuring instrument. For example, thevernier caliper (fig. 6-5) has 25 markings onthe vernier for 24 on the caliper scale. Thecaliper is marked off to read to fortieths (0.025)of an inch, and the vernier extends the accuracyto a thousandth of an inch.
0.30000.07500.00800.0004
0.3834
Figure 6-5.–A vernier caliper.
Vernier Micrometer
By adding a vernier to the micrometer, it ispossible to read accurately to one ten-thousandthof an inch. The vernier markings are on thesleeve of the micrometer and are parallel tothe thimble markings. There are 10 divisionson the vernier that occupy the same space as 9divisions on the thimble. Since a thimble spaceis one thousandth of an inch, a vernier space is1
of9
inch, or9
inch. It is1
inch10 1000 10000 10000
less than a thimble space. Thus, as in the pre-ceding explanation of verniers, it is possible toread the nearest ten-thousandth of an inch byreading the vernier digit whose marking coin-cides with a thimble marking.
In figure 6-6 (A), the last major divisionshowing fully on the sleeve index is 3. Thethird minor division is the last mark clearly
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showing (0.075). The thimble division nearestand below the index is the 8 (0.008). The ver-nier marking that matches a thimble markingis the fourth (0.0004). Adding them all together,we have,
The reading is 0.3834 inch. With practice thesereadings can be made directly from the microm-eter, without writing the partial readings.
Figure 6-6.–Vernier micrometer settings.
Practice problems:
1. Read the micrometer settings in figure 6-6.
Answers:
1. (A) See the foregoing example.
(B) 0.1539 (E) 0.4690
(C) 0.2507 (F) 0.0552
(D) 0.2500
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1-64. The product, in s impl i f ied form, of themultiplication, problem; 4 (2 hours22 minutes 32 seconds) is1. 8 hours 88 minutes 128 seconds2. 8 hours 90 minutes 8 seconds3. 9 hours 28 minutes 8 seconds4. 9 hours 30 minutes 8 seconds
1-65. The product of 12 miles and 13 miles is
1. 156 miles2. miles3. 156 milessquare4. 156
1-66. The product of 2 feet 8 inches times3 feet 4 inches may be found by1. mult ip ly ing 2-feet t imes 3 feet then
multiplying 8 inches times 4 inches2. multiplying 3 feet times 2 feet 8
inches then multiplying 4 inches times2 feet 8 inches
3. converting 2 feet 8 inches to 2 feet23
and 3 feet 4 inches to 3then mult ip ly ing
1 fee t and3
4. changing 2 feet 8 inches to 3 feet and3 feet 4 inches to 4 feet and thenmul t ip l y ing
1-67. If a pipe 22 feet 6 inches long is cut into3 equal lengths, how long are the pieces?(Neglect the width of the saw cuts.)1. 7 feet 1 inch2. 7 feet 3 inches3. 7 feet 4 inches4. 7 feet 6 inches
1-68. The result of dividing 23 hours 31 minutes20 seconds by 5 is1. 43 hours 6 minutes 4 seconds1
52. 4 hours 0 minutes 4224 seconds3. 4 hours 42 minutes 16 seconds4. 4 hours 6 minutes 4 seconds
1-69. In which of the following series ofoperations is the order in which theoperations are performed important?l . 2 + 3 + 52. (3) (9) (7)3. 6 x 8 x 94. 48 ÷ 6 x 3
1-70. The answer to the problem 24 ÷ 4 ÷ 3 ÷ 2i s1. not defined2. 13. 44. 9
1-71. The order of operations is important ifdiv is ion or mult ipl icat ion is involvedwith other operations, Use the rulespertaining to a series of mixed operationsto calculate the value of 6 x 4 + 8 ÷ 2.1. 162. 283. 364. 48
1-72. The number 36 is a multiple of1, 2, 3, 4, 6, 9, 18, 36, and1. 102. 113. 124. 13
1-73. An odd number when divided by 2 producesa remainder of 1.
1-74. The number 7 is a factor ofl . 112. 173. 244. 35
1-75. What is the value of x if x = (3)(0)(4)(6)?l . 02. 183. 244. 72
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Assignment 7
Fundamentals of Algebra; Factoring Polynomials
Textbook Assignment: Chapters 9, 10 (111-117)
7-1. The literal numbers a, x, and p are moregeneral than the numbers 9, 8, and 7.
7-2. The commutative law for addition is il-lustrated by the equation1 . ab = ba2. a + a = b + b3. a + b = b + a4. a(b + c) = ab + ac
7-3. The associat ive law of mult ip l icat ion isi l lustrated by the equat ion1. abc = acb = cba2 . a x (b + c) = c x (b + a)3 . a (b + c + d) = ab + ac + ad4. a· (b·c) = a·b·c = (a·b)·c
7-4. If a = 2, b = -3, and c = 4, the algebraicsum of a - b - c equals1. - 52. 13 . 34. 9
7-5. If r = 1, s = 3, t = 12, and x = 15, whatis the value of the expression
2rx?t -s
1. - 3 3. 22. - 2 4. 3
7-6. The algebraic expression
is considered to be three numbers.
7-7. What is the value of the algebraic ex-pression
5x2 - 2xy + (3x)2
when x = 2 and y = -3?1 . 442 . 683 . 1244. 148
7-8. What name is given to the algebraic ex-pression ax - 2bx + cx2 - 4?1 . Monomial2. Binomial3. T r inomia l4. Polynomial
7-9. Which statement is true regarding themonomial 17xyz?1. 17 i s the coe f f i c ien t o f xyz .2. 17x is the coeff ic ient of yz.3. 17xy i s the coe f f i c ien t o f z .4. Each of the above is a true statement.
7-10. In the expression xy, what is the co-e f f i c ien t o f xy?1. 12. x3. y4 . x y
7-11. What is the coef f ic ient of x2y in theexpression x2y - ab?1. 12. 23. x 2
4. y
7-12. Two terms of an expression are said to bel i ke i f they con ta in1. at least one factor in common2 . the same numerical coefficient3. the same l i teral factors with only
their exponents di f ferent4. the same l i teral factors raised to the
same powers
7-13. The like terms in the expression
2 ac2 - 2bc2 + ac2 - 2c2 are1. 2ac2 and 2bc2
2 . 2ac2 and ac2
3. 2ac2 and 2c2
4. 2bc2 and 2c2
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