The average usually refers to the arithmetic mean or just the mean average.

To find the mean of a set of n numbers, add the numbers in the set and divide the sum

by n. For example, the average (or arithmetic

mean) of 3, 7, 10, and 12 is: .

The number multiplied times a variable or a product of variables or

powers of variables in a term. For example, 123 is the coefficient in the term 123x3

y.

This means to figure out or calculate. If you’re asked to evaluate 5 + 3, that

means to simplify the term to 8.

A positive integer that can only be divided evenly by itself and 1. For

example, 2, 3, 5, 7, 11, 13, and so on are all primes. One afternoon, all the famous math-

ematicians got together over a beer and agreed among themselves that 1 is not a prime

number.