1.2 Order of Operations - Rules for arithmetic and algebra...

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    Rules for arithmetic and algebra expressions that describe what sequence to follow to evaluate an expression involving more than one operation .
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    Step 1: First perform operations that are within grouping symbols such as parenthesis (), brackets [], and braces {}, and as indicated by fraction bars. Parenthesis within parenthesis are called nested parenthesis (( )). Step 2: Evaluate Powers ( exponents ) or roots . Step 3: Perform multiplication or division operations in order by reading the problem from left to right. Step 4: Perform addition or subtraction operations in order by reading the problem from left to right.
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    5 3 6 21 × ÷ + 5 3 6 21 × ÷ + 5 3 6 21 × ÷ + 5 3 27 × ÷ 5 9 × 45 = 5 3 6 21 × ÷ + 5 2 21 × + 5 2 21 × + 10 21 + 31 = 5 3 27 × ÷ Performing operations left to  right only Performing operations  using order of operations The rules for order of operations exist so that everyone can perform the same consistent operations and achieve the same results. Method 2 is the correct method. Can you imagine what it would be like if calculations were performed differently by various financial institutions or what if doctors prescribed
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