An integer is any whole number, including zero. An integer can be either positive or negative. Examples include -77, -1, 0, 55, 119.

Branch | Coast Guard |

MOS | OS |

Title | Operations Specialist |

Description | The tactical command, control, and communications rating. Operations Specialists use the technology employed in afloat Combat Information Centers and Operations Center Command and Control Systems to employ Coast Guard tactics, procedures, and doctrine; Operations Specialists perform a central role in the execution of nearly all Coast Guard operations; Tactical command and control experts, coordinating responses to a wide variety of Coast Guard missions, including Search and Rescue, Maritime Law Enforcement, Marine Environmental Protection, Homeland Security, and National Defense; Operate state-of-the-art communications systems, tactical tracking and identification systems, shipboard navigation systems, and advanced operational planning applications. Able to perform the tasks of E1 through E6; Conduct Arrival, Access, Transfer, Termination, and U.S. Coast Guard Anti-Terrorism Force Protection Level I personnel security briefs; Develop Physical Security and Force Protection Plan, and Emergency Action Plans for protection of national security; Manage the units personnel security program; Verify unit COMTAC allowance; Prepare communications and Search and Rescue (SAR) case studies; Plan and Coordinate Search and Rescue Exercises; Review unit Command Center Manual or Combat Systems doctrine or C3ISR Standard Operating Procedures, and unit Continuity of Operations Plan publications for improvements. Able to perform the tasks of E1 and E2; Configure communications circuits, including antennas, cryptographic equipment, transceiver, radio handsets, speakers, and local operating positions; Guard assigned radio frequencies, broadcast and communicate with circuit discipline; Establish voice communications and maintain a radio log and communications schedule; Impose radio silence; Identify a distress situation, Initiate Critical Incident Communications in response to an actual or simulated incident, establish communications with vessels in distress; Collect distress information and brief Search and Rescue Units; Utilize the Command, Control, Communications, Intelligence, Surveillance and Reconnaissance (C3ISR) system; Identify Obstruction to Navigation, Potential Hazard to Navigation, Transportation Security Incident, Aids to Navigation discrepancy, Ports, Waterways and Coastal Security, Living Marine Resource, Counter Drug Enforcement, Pollution Incident, Alien Migrant Interdiction Operations, and Boating Safety; Apply markings to, receive, prepare and destroy classified material and COMSEC material; Maintain restricted space visitors log and screen visitors to this space; Complete a watch to watch inventory. Participate in an Emergency Action Plan (EAP). Able to perform the tasks of E1 through E4; Utilize a Command, Control, Communications, Intelligence, Surveillance and Reconnaissance (C3ISR) system; Monitor the progress of a search and rescue response, marine MARSEC levels including Ports, Waterways & Coastal Security (PWCS) assets, Captain of the Port (COTP) order status, Cargo of Interest (COI) status, Critical Infrastructure (CI) status, Vessel of Interest (VOI) status, Facilities of Interest (FOI) status, Regulated Navigation Area (RNA) order, and Scheduled marine events; Prepare a COMMSHIFT, COMMSPOT, Search Action Plan (SAP), and Personnel Security Actions; Handle, order, download, enter in library, issue, inventory, and process corrections of COMTAC material. Document, evaluate and develop a Search and Rescue case and distress information; Select appropriate Search and Rescue Units. Review Search and Rescue case documentation for quality assurance; Initiate responses to Potential Hazards to Navigation, Mass casualty incidents, and Major pollution incidents; Evaluate maritime law enforcement incidents for appropriate response; Issue and transfer COMSEC material; Conduct physical security inspection and COMSEC self inspection. Complete EKMS inventory. |

Subtests | Arithmetic Reasoning, Paragraph Comprehension, Word Knowledge |

- 13 Questions
- 54 Problems
- 36 Flash Cards

An integer is any whole number, including zero. An integer can be either positive or negative. Examples include -77, -1, 0, 55, 119.

A rational number (or fraction) is represented as a ratio between two integers, a and b, and has the form \({a \over b}\) where a is the **numerator** and b is the **denominator**. An **improper fraction** (\({5 \over 3} \)) has a numerator with a greater absolute value than the denominator and can be converted into a **mixed number** (\(1 {2 \over 3} \)) which has a whole number part and a fractional part.

The absolute value is the positive magnitude of a particular number or variable and is indicated by two vertical lines: \(\left|-5\right| = 5\). In the case of a variable absolute value (\(\left|a\right| = 5\)) the value of a can be either positive or negative (a = -5 or a = 5).

A factor is a positive integer that divides evenly into a given number. The factors of 8 are 1, 2, 4, and 8. A multiple is a number that is the product of that number and an integer. The multiples of 8 are 0, 8, 16, 24, ...

The greatest common factor (GCF) is the greatest factor that divides two integers.

The least common multiple (LCM) is the smallest positive integer that is a multiple of two or more integers.

A prime number is an integer greater than 1 that has no factors other than 1 and itself. Examples of prime numbers include 2, 3, 5, 7, and 11.

Fractions are generally presented with the numerator and denominator as small as is possible meaning there is no number, except one, that can be divided evenly into both the numerator and the denominator. To reduce a fraction to lowest terms, divide the numerator and denominator by their greatest common factor (GCF).

Fractions must share a **common denominator** in order to be added or subtracted. The common denominator is the least common multiple of all the denominators.

To multiply fractions, multiply the numerators together and then multiply the denominators together. To divide fractions, invert the second fraction (get the reciprocal) and multiply it by the first.

An exponent (cb^{e}) consists of **coefficient** (c) and a **base** (b) raised to a **power** (e). The exponent indicates the number of times that the base is multiplied by itself. A base with an exponent of 1 equals the base (b^{1} = b) and a base with an exponent of 0 equals 1 ( (b^{0} = 1).

To add or subtract terms with exponents, both the base and the exponent must be the same. If the base and the exponent are the same, add or subtract the coefficients and retain the base and exponent. For example, 3x^{2} + 2x^{2} = 5x^{2} and 3x^{2} - 2x^{2} = x^{2} but x^{2} + x^{4} and x^{4} - x^{2} cannot be combined.

To multiply terms with the same base, multiply the coefficients and add the exponents. To divide terms with the same base, divide the coefficients and subtract the exponents. For example, 3x^{2} x 2x^{2} = 6x^{4} and \({8x^5 \over 4x^2} \) = 2x^{(5-2)} = 2x^{3}.

To raise a term with an exponent to another exponent, retain the base and multiply the exponents: (x^{2})^{3} = x^{(2x3)} = x^{6}

A negative exponent indicates the number of times that the base is divided by itself. To convert a negative exponent to a positive exponent, calculate the positive exponent then take the reciprocal: \(b^{-e} = { 1 \over b^e }\). For example, \(3^{-2} = {1 \over 3^2} = {1 \over 9}\)

Radicals (or **roots**) are the opposite operation of applying exponents. With exponents, you're multiplying a base by itself some number of times while with roots you're dividing the base by itself some number of times. A radical term looks like \(\sqrt[d]{r}\) and consists of a **radicand** (r) and a **degree** (d). The degree is the number of times the radicand is divided by itself. If no degree is specified, the degree defaults to 2 (a **square root**).

The radicand of a simplified radical has no perfect square factors. A **perfect square** is the product of a number multiplied by itself (squared). To simplify a radical, factor out the perfect squares by recognizing that \(\sqrt{a^2} = a\). For example, \(\sqrt{64} = \sqrt{16 \times 4} = \sqrt{4^2 \times 2^2} = 4 \times 2 = 8\).

To add or subtract radicals, the degree and radicand must be the same. For example, \(2\sqrt{3} + 3\sqrt{3} = 5\sqrt{3}\) but \(2\sqrt{2} + 2\sqrt{3}\) cannot be added because they have different radicands.

To multiply or divide radicals, multiply or divide the coefficients and radicands separately: \(x\sqrt{a} \times y\sqrt{b} = xy\sqrt{ab}\) and \({x\sqrt{a} \over y\sqrt{b}} = {x \over y}\sqrt{a \over b}\)

To take the square root of a fraction, break the fraction into two separate roots then calculate the square root of the numerator and denominator separately. For example, \(\sqrt{9 \over 16}\) = \({\sqrt{9}} \over {\sqrt{16}}\) = \({3 \over 4}\)

Scientific notation is a method of writing very small or very large numbers. The first part will be a number between one and ten (typically a decimal) and the second part will be a power of 10. For example, 98,760 in scientific notation is 9.876 x 10^{4} with the 4 indicating the number of places the decimal point was moved to the left. A power of 10 with a negative exponent indicates that the decimal point was moved to the right. For example, 0.0123 in scientific notation is 1.23 x 10^{-2}.

A factorial has the form n! and is the product of the integer (n) and all the positive integers below it. For example, 5! = 5 x 4 x 3 x 2 x 1 = 120.

Arithmetic operations must be performed in the following specific order:

**P**arentheses**E**xponents**M**ultiplication and**D**ivision (from L to R)**A**ddition and**S**ubtraction (from L to R)

The acronym **PEMDAS** can help remind you of the order.

The distributive property for multiplication helps in solving expressions like a(b + c). It specifies that the result of multiplying one number by the sum or difference of two numbers can be obtained by multiplying each number individually and then totaling the results: a(b + c) = ab + ac. For example, 4(10-5) = (4 x 10) - (4 x 5) = 40 - 20 = 20.

The distributive property for division helps in solving expressions like \({b + c \over a}\). It specifies that the result of dividing a fraction with multiple terms in the numerator and one term in the denominator can be obtained by dividing each term individually and then totaling the results: \({b + c \over a} = {b \over a} + {c \over a}\). For example, \({a^3 + 6a^2 \over a^2} = {a^3 \over a^2} + {6a^2 \over a^2} = a + 6\).

The commutative property states that, when adding or multiplying numbers, the order in which they're added or multiplied does not matter. For example, 3 + 4 and 4 + 3 give the same result, as do 3 x 4 and 4 x 3.

Ratios relate one quantity to another and are presented using a colon or as a fraction. For example, 2:3 or \({2 \over 3}\) would be the ratio of red to green marbles if a jar contained two red marbles for every three green marbles.

A proportion is a statement that two ratios are equal: a:b = c:d, \({a \over b} = {c \over d}\). To solve proportions with a variable term, **cross-multiply**: \({a \over 8} = {3 \over 6} \), 6a = 24, a = 4.

A rate is a ratio that compares two related quantities. Common rates are speed = \({distance \over time}\), flow = \({amount \over time}\), and defect = \({errors \over units}\).

Percentages are ratios of an amount compared to 100. The percent change of an old to new value is equal to 100% x \({ new - old \over old }\).

The average (or **mean**) of a group of terms is the sum of the terms divided by the number of terms. Average = \({a_1 + a_2 + ... + a_n \over n}\)

A sequence is a group of ordered numbers. An **arithmetic sequence** is a sequence in which each successive number is equal to the number before it plus some constant number.

Probability is the numerical likelihood that a specific outcome will occur. Probability = \({ \text{outcomes of interest} \over \text{possible outcomes}}\). To find the probability that two events will occur, find the probability of each and multiply them together.

Many of the arithmetic reasoning problems on the ASVAB will be in the form of word problems that will test not only the concepts in this study guide but those in Math Knowledge as well. Practice these word problems to get comfortable with translating the text into math equations and then solving those equations.