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Master the rules of Order of Operations: Parentheses, Exponents, Multiplication, Division, Addition, Subtraction for accurate results in mathematical expressions. Learn through examples and practice problems.
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Order of Operations By Carl Stephen
Order of Operations Parentheses Exponents Square roots Multiplication Division Addition Subtraction
Order of Operations In doing the four basic operations, you follow three rules: • Do what is in parentheses, if there are parentheses, exponents, and square roots. • Do multiplication and division from left to right. • Do addition and subtraction from left to right.
Examples 5(3+7)-13 7(9-5)+18/(7-4) 7(2+7)-15 5(10)-13 7(4)+18/3 7(9)-15 50-13=37 28+6=34 63-15=48 8+2(9-2) 8+2(7) 8+14=22
Evaluating Mathematical ExpressionswithLetters Remember: To evaluate a mathematical expression you need to substitute a particular number for a letter and then do the order of operations.
Examples Evaluate when a=2 Evaluate when a=3; b=5 2(a+7)+3 8b-(a+4) 2(2+7)+3 8*5-(3+4) 2*9+3 8*5-7 18+3=21 40-7=33 Evaluate when a=4 Evaluate when b=5 6a+5 4b-1 6*4+5 4*5-1 24+5=29 20-1=19