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Numerical Expressions Chapter 1, Lesson 1B Pages 29-32

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Numerical Expressions (1-1B) Learning Objective #2: I can evaluate expressions using the order of operations. Found in Grade 5 CCSS Vocabulary: Numerical expression Order of operations

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Numerical Expressions (1-1B) The expression 6 + 4 x 3 is a numerical expression. To evaluate expressions, use the order of operations. These rules ensure that numerical expression have only one value.

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Numerical Expressions Remembering the order of operations is as easy as remembering the saying: Please Excuse My Dear Aunt Sally

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Please Excuse… The “P” stands for items in parenthesis Do all items in the parenthesis first The “E” stands for Exponents Do anything that has a exponent (power) second 8282

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Represents Multiply and Divide Do all the multiplication and division third Do which ever one of these comes first in the problem … My Dear… **Work these two operations from left to right

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Represents Add and Subtract Do all addition and subtraction last Do which ever one of these comes first **Work left to right … Aunt Sally.

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Order of Operations 3 ways to show multiplication?

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Examples… WORK DOWN! 1) (10 + 8) ÷ 3 – 1 2) 15 - 10 ÷ 5 + 2 3) 45 ÷ (9 + 6 ) x 2 4) 9 5 + (10 ÷ 5) 3 2

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More Examples Write an expression first.

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Homework…

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