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Negative numbers: numbers less than zero Positive Numbers: numbers greater than zero Zero: neither positive nor negative Number line: graphical representation of the real numbers positive numbers are to the right of zero negative numbers are to the left of zero Signed numbers: the set of positive and negative numbers and zero Natural numbers: {1, 2, 3 …} Whole numbers: {0, 1, 2, 3 …} Integers: {…-2, -1, 0, 1, 2…} Smaller numbers: are to the left on the number line < symbol for “less than” ≤ symbol for “less than or equal to” > symbol for “greater than” ≥ symbol for “greater than or equal to” Opposites: 2 numbers equidistant from 0 in opposite directions Integers: whole numbers and their opposites Absolute Value: distance between a number and 0 on the number line | -2 |: the absolute value of -2; answer is 2 Additive inverse: same number, opposite sign (same as opposite) Sum of a number and its opposite: zero Even numbers: {0, 2, 4, 6…} Odd numbers: {1, 3, 5…} Factors: numbers that are multiplied Base: the number that is multiplied in exponential notation Exponent: indicates how many times the base is a factor 53 5X5X5 Even number of negative factors: answer is + Odd number of negative factors: answer is negative Negative base raised to an even power: answer is + Negative base raised to an odd power: answer is – -23: -2x2x2 (-2)3: (-2)(-2)(-2) Zero power: anything raised to the zero power equals 1