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Pre-Algebra Lesson 7-1

# Pre-Algebra Lesson 7-1 - groceries 5.00 17.95 22.95...

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Problem-Solving Strategy: Work Backwards Objective: Solve problems by working backwards.

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Problem-Solving Strategy: Work Backwards Example Sam needs to know how much money he had before he began his spending spree. He spent \$5.98 on food, \$6 on a movie, and \$47.34 on a pair of shoes. Then his mother gave him \$20 to buy groceries. The groceries totaled \$17.95. If Sam has \$5 left, how much money did Sam start with?
Problem-Solving Strategy: Work Backwards Explore You know all the amounts Sam spent and what he had when he was done. You want to find the amount he had to begin with. Plan Since this problem gives the end result and asks something that happened earlier, start with the result and work backward. Undo each step

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Problem-Solving Strategy: Work Backwards Solve When Sam was done, he had \$5. 5.00
Problem-Solving Strategy: Work Backwards Solve When Sam was done, he had \$5. Undo the \$17.95 he spent on

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Unformatted text preview: groceries. 5.00 +17.95 22.95 Problem-Solving Strategy: Work Backwards Solve When Sam was done, he had \$5. Undo the \$17.95 he spent on groceries. Undo the \$20 his mother gave him. 5.00 +17.95 22.95-20.00 2.95 Problem-Solving Strategy: Work Backwards Solve When Sam was done, he had \$5. Undo the \$17.95 he spent on groceries. Undo the \$20 his mother gave him. Undo the three purchases. 5.00 +17.95 22.95-20.00 2.95 +47.34 +6.00 +5.98 Problem-Solving Strategy: Work Backwards Solve When Sam was done, he had \$5. Undo the \$17.95 he spent on groceries. Undo the \$20 his mother gave him. Undo the three purchases. Sam started with \$62.27 5.00 +17.95 22.95-20.00 2.95 +47.34 +6.00 +5.98 62.27 Problem-Solving Strategy: Work Backwards Examine Work the problem forward to check the solution. 62.27-5.98-6.00 -47.34 2.95 +20.00 22.95-17.95 5.00...
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Pre-Algebra Lesson 7-1 - groceries 5.00 17.95 22.95...

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