3), TERMINATINGDECIMALS (.75), AND REPEATING DECIMALS (.666 . . . )■ I...
3
), terminatingdecimals (.75), and repeating decimals (.666 . . . )■
Irrational numbersIrrational numbers are numbers that cannot be expressed as terminating orrepeating decimals:πor 2.O
RDER OF
O
PERATIONS
Most people remember the order of operations by using a mnemonic device such as PEMDAS or PleaseExcuse My Dear Aunt Sally. These stand for the order in which operations are done:ParenthesesExponentsMultiplicationDivisionAdditionSubtractionMultiplication and division are done in the order that they appear from left to right. Addition and sub-traction work the same way—left to right.Parentheses also include any grouping symbol such as brackets [ ], braces { }, or the division bar.Examples