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Math Bellwork #2: Evaluating Expressions with Order of Operations

Learn how to evaluate variable expressions by replacing variables with numbers and using order of operations. Examples provided. Practice sheets included. Homework assigned. Great preparation for algebraic expressions.

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Math Bellwork #2: Evaluating Expressions with Order of Operations

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  1. 8-28-12 Math 7 • Bellwork #2 • Please have the following on your desk: • Name Tag • Math book • HW • Red Pen • Pencil

  2. 1-3 EVALUATING EXPRESSIONS p.13 You can EVALUATE a variable expression by replacing each variable with a number. Then use the order of operations to simplify.

  3. EXAMPLES • Evaluate 14 – 10 + 8 Use order of operations to first subtract, then add. This numeric expression simplifies to 12. • Evaluate 4y – 15 for y = 9. Replace the variable with 9 and rewrite the expression as 4(9) -15. Then use order of operations to simplify to 36 – 15 and simplify again to 21.

  4. Try This • 63 – 5x, for x = 7 • 4(t + 3) + 1 for t = 8

  5. Try This 28 45 • 63 – 5x, for x = 7 • 4(t + 3) + 1 for t = 8

  6. EXAMPLE 2 • Evaluate For a = 2, b = 5 and c = 10 Substitute and rewrite the expression: Then simplify: 3(2)(5) + 5 6(5) + 5 30 + 5 35

  7. “Try This p.13” • 3) 6(g + h), for g = 8 and h = 7 • 4) 2xy – z, for x = 4, y = 3 and z = 1 • 5) For r = 13 and s = 11

  8. Try This 90 23 12 • 6(g + h), for g = 8 and h = 7 • 2xy – z, for x = 4, y = 3 and z = 1 For r = 13 and s = 11

  9. Example 4 • An online music store charges $14 for each CD. Shipping costs $6 per order. Write a variable expression for the cost of ordering CDs. Then find the cost of ordering 4 CDs. $14 for each CD plus $6 shipping. 14n + 6 • For four CDs, 14(4) + 6 Simplify: 56 + 6 = 62

  10. HOMEWORK P. 15 #1-9 all, 11-29 odd

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