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# Order of operations web

## on Sep 19, 2013

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## Order of operations webPresentation Transcript

• Bell Ringer You buy a used guitar for \$50. You then pay \$10 for each of five guitar lessons. Write an expression for the problem. Find the total cost.
• Bell Ringer You buy a used guitar for \$50. You then pay \$10 for each of five guitar lessons. Write an expression for the problem. (10 x 5) + 50 Find the total cost. \$100
• Where we were… • Commutative Property of addition • Order doesn’t matter in addition • 5 + 1 = 1 + 5 • Associative Property of addition • Grouping numbers in different ways doesn’t change the sum • (1 + 2) + 3 = 1 + (2 + 3) • Identity Property of addition • Adding 0 to any number doesn’t change the number • 14 + 0 = 14
• Where we are… • Students will learn to… • Review Order of Operations • Define and combine terms
• Vocabulary • Terms • Parts of an expression that are added together. • Why do you think the definition mentions only adding and not subtraction? • Order of Operations • a set of rules used to evaluate expressions with multiple terms
• 5 + 6 x 5 • The goal for order of operations is to simplify the expression so that only addition (or subtraction) is left. • Which operations should I do first? Why? • 5 + 6 x 5 • 5 + 30 • 35
• 10 x 3 + 32 • Which operations are most complex? • Which operations need to be completed in order to leave only addition? • 10 x 3 + 32 • 30 + 9 • 39
• 20 – 42 ÷ 2 • Which operations are most complex? • Which comes first? Exponent or division? • You can’t use the quantity of 42 until it is simplified. • 20 – 16 ÷ 2 • 20 – 8 • 12
• 18 – 10 + 5 - 1 • Which is the most complex operation? • They subtraction and addition are equally complex… subtraction can be changed to addition • Work left to right… • 18 – 10 + 5 • 8 + 5 - 1 • 13 – 1 • 12
• Order of Operations 1) Evaluate expressions inside grouping symbols 2) Evaluate powers 3) Multiply and/or divide from left to right 4) Add and/or subtract from left to right
• Homework • Pg. 19 • #1-2, 6, 8, 15-16, 43 • 7 Problems • Tell me your book # • Due on Friday
• Where we were… • Properties of addition • Commutative Property • Associative Property • Identity Property • Addition and Subtraction of Integers • Adding the opposite can change all subtraction problems to addition. • Order of operations
• Where we are… • Students will learn to… • Study the distributive property • Describe how the distributive property works
• Partner Activity • Read the article • Alternate paragraphs with your partner • On a separate sheet of paper, answer the questions in the magazine. • Once you are finished, come get a worksheet • Answer the questions with your partner • Staple your paper and worksheet together and hand it in before you leave.
• Exit Ticket – Twitter summary • Pick a number: 1, 2, 3 or 4 and write it on your twitter summary sheet. • Answer the question with the same number you picked. • 1) Describe and give an example of the commutative property of addition. • 2) Describe and give and example of the associative property of addition. • 3) Describe and give an example of the identity property of addition. • 4) Describe order of operations.