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1-4. Order of Operations. Course 1. Warm Up. Problem of the Day. Lesson Presentation. Warm Up Perform the operations in order from left to right. 1. 8 + 4 – 2 2. 9  3 + 1 3. 7 – 3 + 5 4. 20 ÷ 4 + 6. 10. 28. 9. 11. Problem of the Day 0 1 2 3 4 5 6 7 8 9 = 1

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1-4

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  1. 1-4 Order of Operations Course 1 Warm Up Problem of the Day Lesson Presentation

  2. Warm Up Perform the operations in order from left to right. 1.8 + 4 – 2 2. 9  3 + 1 3. 7 – 3 + 5 4. 20 ÷ 4 + 6 10 28 9 11

  3. Problem of the Day 0 1 2 3 4 5 6 7 8 9 = 1 Put the appropriate plus or minus signs between the numbers so that the total equals 1. 0 + 1 – 23 + 45 + 67 – 89 = 1

  4. Learn to use the order of operations.

  5. Vocabulary numerical expressions evaluate order of operations

  6. A numerical expression is a mathematical phrase that includes only numbers and operation symbols. When you evaluate a numerical expression, you find its value.

  7. When an expression has more than one operation, you must know which operation to do first. To make sure that everyone gets the same answer, we use the order of operations.

  8. Helpful Hint The first letters of these words can help you remember the order of operations. Please Parentheses Excuse Exponents My Multiply Dear Divide Aunt Add Sally Subtract

  9. There are no parentheses or exponents. Divide. Subtract. Additional Example 1A: Using the Order of Operations Evaluate the expression. 15 – 10 ÷ 2 15 – 10 ÷ 2 15 – 5 10

  10. Perform operations within parentheses. Multiply. Add. Additional Example 1B: Using the Order of Operations Evaluate the expression. 9 + (21 ÷ 7)  5 9 + (21 ÷ 7)  5 9 + 3 5 9 + 15 24

  11. There are no parentheses or exponents. Divide. Subtract. Check It Out: Example 1A Evaluate the expression. 12 – 6 ÷ 2 12 – 6 ÷ 2 12 – 3 9

  12. Perform operations within parentheses. Multiply. Add. Check It Out: Example 1B Evaluate the expression. 7 + (24 ÷ 6)  3 7 + (24 ÷ 6)  3 7 + 4 3 7 + 12 19

  13. 2 + 6  4 4 There are no parentheses. Multiply. Add. Find the value of the number with the exponent. Additional Example 2A: Using the Order of Operations with Exponents Evaluate the expression. 24 + 6  4 16 + 6  4 16 + 24 40

  14. 24 ÷ (9 – 6)  32 – 10 24 ÷ 3 32 – 10 24 ÷ 3  9 – 10 Perform operations within parentheses. Multiply. Divide. Find the value of the number with the exponent. Subtract. Additional Example 2B: Using the Order of Operations with Exponents Evaluate the expression. 24 ÷ (9 – 6)  32 – 10 8 9 – 10 72 – 10 62

  15. 42 + 3  7 There are no parentheses. Multiply. Add. Find the value of the number with the exponent. Check It Out: Example 2A Evaluate the expression. 42 + 3  7 16 + 3  7 16 + 21 37

  16. 32 ÷ (8 – 4)  22 – 12 32 ÷ 4 22 – 12 32 ÷ 4  4 – 12 Perform operations within parentheses. Multiply. Divide. Find the value of the number with the exponent. Subtract. Check It Out: Example 2B Evaluate the expression. 32 ÷ (8 – 4)  22 – 12 8 4 – 12 32 – 12 20

  17. Additional Example 3: Consumer Application Mr. Kellett bought 6 used CDs for $4 each and 5 used CDs for $3 each. Evaluate the following expression to find the amount Mr. Kellett spent on CDs. 6  4 + 5  3 24 + 15 39 Mr. Kellett spent $39 on CDs.

  18. Check It Out: Example 3 Ms. Nivia bought 4 new CDs for $8 each and 6 used CDs for $4 each. Evaluate the following expression to find the amount Ms. Nivia spent on CDs. 4  8 + 6  4 32 + 24 56 Ms. Nivia spent $56 on CDs.

  19. Lesson Quiz Evaluate each expression. 1. 15 + 4  2 2. (12 – 5)2 – 10 3. 3 + 9  2 – 5 4. 43 – 30 ÷ 2 5. Chaz bought 4 football cards for $2 each and 8 baseball cards for $3 each. Evaluate the expression to find the amount Chaz spent on cards: 4  2 + 8  3. 23 39 16 49 $32

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