Algebra I Flashcards
GEDMAS
Order of operations
Grouping, exponents, division/multiplication, addition/subtraction
Real numbers
Represent real values. Can be rational or irrational or negative. Whatever
Natural Numbers vs. Whole Numbers
Natural numbers are integers that start with 1
Whole numbers are integers that starte with 0
Integers can be negative
Rational Numbers
Can be any number that can be represented by a fraction made up of two integers (can have results that are forever repeating, as long as there is a pattern)
Irrational Numbers
Numbers that cannot be expressed as a fraction of two integers. Go on forever and don’t have any repeated patterns
Prime vs. Composite
Prime numbers are numbers that can only be evenly divided by itself and 1. The first prime number is 2, and it is the only even one. Composite numbers are any number that isn’t prime
Factorial definition
n! = n*(n-1)*(n-2)*(n-3)…3*2*1
And 0! = 1
Communitive property
Order doesn’t matter
a+b=b+a
Associative Property
Grouping doesn’t matter:
(a+b)+c = a+(b+c)
Distributive Property
a (b + c) = ab + ac
Structure of a fraction
Numerator / Denominator
What is an improper fraction
The numerator is greater than the denominator
What is a mixed number
Integer plus a fraction
What is a least common multiple
The smallest number that two numbers can evenly go into
Sum of a finite arithmetic series
where a1 is the first term, an is the last term
Sum of an infinite geometric sequence
a is the first term, r is the ratio (0 to 1)
Sum of a finite geometric sequence
a is the first term, r is the ratio 0 to 1
The 5 rules of exponents
Keep in mind the bottom two apply to radicals
Rules for radical expressions (same as the rules of exponents, but a good visual)
Fractional radical notation
What is prime factorization?
prime factorization of a number is the unique product of prime numbers that results in the given number
How do you determine what the smallest number is that a group of numbers can evenly go into?
Do prime factorization on all the numbers, and multiply the prime numbers by each other for a final product (the catch is, don’t repeat values if the prime factor is already listed)
How to simplify fractions to solve an equation
The key here is to multiply both sides of the equation by the least common denominator, not just one side!
Rules of Divisibility (2-6)
2: number is even
3: sum of digits is a number divisibile by 3
4: last two digits form a number divisible by 4
5: 5 or 0 last digit
6: the number is divisible by 2 and 3


