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Order of O perations

Order of O perations. A rule of precedence in solving mathematical expressions. What kind of expressions need this to be solved?. Remember, to use the order of operations you need a math expression. And this expression must include at least two different math symbols.

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Order of O perations

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  1. Order of Operations A rule of precedence in solving mathematical expressions.

  2. What kind of expressions need this to be solved? • Remember, to use the order of operations you need a math expression. • And this expression must include at least two different math symbols. • Parenthesis, exponents and roots, multiplication, division, addition, and subtraction symbols.

  3. Would this be an example? • 2.424+3.563 • NO! • Why? • It only contains one math symbol.

  4. Would this be an example? • 2+40÷2 • YES! • Why? • It contains more than one math symbol.

  5. Recall… • PEMDAS acronym in solving these problems • Parenthesis • Exponent • Multiplication • Division • Addition • Subtraction

  6. Let’s try this one • 3 + 6 x (5 + 4) ÷ 3 - 7 • PEMDAS • Steps • Parenthesis • Multiplication • Division • Addition • Subtraction

  7. Left to Right Rule • This says: when you have either multiplication and division or addition and subtraction in a ‘backwards’ order in an expression, you can simply solve them going left to right. • Sometimes these two pairs of symbols aren’t in the order that the PEMDAS acronym shows us in solving problems.

  8. Here’s an example: • 9-3x(8÷2)+6 • Steps: • Parenthesis • Multiplication • Division • SUBTRACTION • Addition • We did subtraction before addition by using the Left to Right rule. • So if the division and multiplication signs switched places, we could use the rule there too.

  9. Now, get together with a partner and try this problem together! • COPY THIS PROBLEM ON YOUR OWN PAPER! • Define each step you will take in solving the problem and use the Left to Right rule if needed. • 9 - 5 ÷ (8 - 3) x 2 + 6² • Remember: PEMDAS

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