ACT Math vocabulary

irrational

a number that can be expressed as a decimal but not a fraction

rational

a number that can be expressed as the ratio of two other numbers, making a fraction

prime

a number that has itself and 1 as its only factors

(exponent) (power)

a number that indicates how many times to multiply a base by itself

decimal

a way of expressing a fraction in which numbers are divided by ten, hundred, thousand, and other powers of ten.

fraction

a way of expressing the division of numbers by stacking one over the other

integers

all real numbers other than decimals or fractions

divisible

an integer can be divided by another integer evenly, with no fraction or decimal left over

radical

another word for the √ sign

distinct

different

even

divisible by 2

number

everything

positive

greater than 0

consecutive

in increasing order

factor

integers that multiply together to make a given product

negative

less than 0

odd

not divisible by 2

order of operations

parentheses, exponents, multiplication, division, addidion, subtraction (pedmas)

absolute value

the distance from zero on the number line

digits

the integers 0 thru 9

reciprocal

the inverse of a number-flip the numerator and denominator

greatest common factor

the largest factor common to two numbers

remainder

the number left over when a number is not divisable by another number

multiple

the product of an integer and another integer

sum

the result of addition

quotient

the result of division

product

the result of multiplication

difference

the result of subtraction

least common multiple

the smallest multiple common to two numbers

imaginary

the square (or any other even) root of a negative number

opposite

two numbers that have the same magnitude but are opposite in signs. (+7 and -7)

real

zero, all positive and negative integers, fractions, decimals, and more