# Algebraic Terms Definition

**Section 1**

Number Theory : Branch of mathematics concerned with
numbers used for counting.

Natural Numbers: N : counting numbers: {1, 2,3, 4,...}

Factors: Natural numbers multiplied together to get a product

Divisible: if when division occurs the remainder is 0.

b|a : a is divisible by b, b is a divisor of a, and b divides a

Prime Number: N > 1 such that only 1 and itself are factors.

Composite Number: N >1 such that it is divisible by a number other than 1 and
itself.

Prime Factorization: Expressing a composite number as a product of primes.

Fundamental Theorem of Arithmetic: Every composite number can have only one
result

for its prime factorization.

Relatively Prime: Pairs of numbers such that the only factor that have in common
is 1,

GCF = 1.

Find Greatest Common Factor: (GCF)

1. Write each number as product of prime

2. Find common primes in all numbers concerned

3. Multiple the common primes together

Least Common Multiple: LCM (Least Common Divisor): smallest natural number that
is

divisible to each number in question.

How to find the LCM

1. Write each number as product pf primes

2. Start with largest number and see what is missing from the others

3. Multiply missing numbers to the largest number

LCM → Common denominator.

**Section 2**

Whole Numbers: {0,1, 2,3, 4,....}

Integers: {...− 4,−3,−2,−1,0,1, 2,3, 4,...}

*** Zero is neither positive or negative

Inequality : < or >; ≤ or ≥

Absolute Value: distance to zero. Absolute value of any integer is positive.

Adding : Sum

Additive Inverse: Sum = 0; opposites

Subtraction: Difference

Multiplication: Product

Quotient: Result of division

Please | ( ) – grouping |

Excuse | Exponents |

My Dear | Multiply / Divide |

Aunt Sally | Add / Subtract |

**Section 3**

Rational Numbers: can be written as a fraction

Fundamental Principle of Rational Numbers

Mixed Number: , sum of
an integer and a rational number.

Improper Fraction: numerator > denominator

Convert Mixed to Improper

Convert Improper to Mixed

Terminating Decimal: decimal that stops

Repeating Decimal: Decimal where digits repeat indefinitely

How to express repeating decimal as fraction

1. Set n = number of digits repeating

2. Count number of digits repeating, and multiply by that power of 10.

3. Subtract equation from #1 from equation in #2.

4. Solve for n.

Reciprocal : multiplicative inverse: flip the fraction; product of a number and
its

reciprocal = 1.

*** Fractions must have common denominators to add or subtract with them.

Density of Rational Number: There will always be some rational number that can
be

found between any two rational numbers.

**Section 4**

radical sign

radical and 2 is a radicand.

Irrational Number: number whose decimal representation is
nether termination or

repeating. Cannot be written as a fraction.

Principal Square Root :
positive number that when multiplied by itself the result is

n.

*** not all square roots are irrational

Product Rule:

Quotient Rule:

Rationalize the denominator: Multiply both numerator and
denominator by the smallest

number to produce a perfect square in the denominator.

**Section 5**

Real Numbers: Union of rational and irrational numbers.

Properties of Real Numbers

Closure: When performing an operation the type of number you put in, your result

is the same type of number.

Associative: (a + b) + c = a + (b + c)

Commutative: a + b = b + a; ab = ba

Distributive: a(b + c) = ab + ac

**Section 6**

Properties of Exponents

Powers of Ten

Positive exponent → move decimal to right same number of digits as zeros.

Negative exponent → move decimal to left same number of digits as zeros.

**For both add filler zeroes.

Scientific Notation:

n is an integer ; 1≤ a <10

Convert from Decimal to Scientific Notation

If n is positive, move n decimals to right, add filler zeros.

If n is negative, move n decimals to left, add filler zeroes.

Convert from Scientific Notation to Decimal

1. Move decimal till you get a number between 1 and 10

2. Number of places is n

3. If original number is < 1 → n is negative,

if original number is > 10 → n is positive.

Computations with Scientific Notation

**Section 7**

Arithmetic Sequence: sequence that each term after the first differs by a
constant number,

we can this constant difference d .

General term:

Geometric Sequence: sequence that each term after the
first is obtained by multiplying

the previous term by a common ratio we refer to as r.

General term:

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