Work backwards
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Work backwards

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Work backwards Work backwards Document Transcript

  • Name _____________________Date ___________<br />Mrs. Labuski & Mrs. Portsmore Per __Work Backwards<br />METHOD 6 –Work Backwards:<br />Some problems give you a sequence of information and ask you to find something that happened at the beginning. To solve a problem like this, you may want to start at the end of the problem and work backwards.<br />Let’s try one: Lucy wants to take a 4:45 bus. It takes her 20 minutes to get to the bus station. She wants to get there 20 minutes early. What time should she leave for the bus station?<br />
    • UNDERSTANDFactsQuestionPLANStrategySOLVECHECK
    Jesse was out playing golf last Thursday. On the first six holes, he lost 4 golf balls. On the next six holes he lost one half of the number of golf balls he had then. On the last six holes, he only lost 2 more golf balls. He finished with 4 golf balls. How many did he start with? <br />
    • UNDERSTANDFactsQuestionPLANStrategySOLVECHECK
    Name _____________________Date ___________<br />Mrs. Labuski & Mrs. Portsmore Per __Work Backwards HW<br />Use the four-step problem solving method to solve the following. Draw the Four-Step Square on loose-leaf and be sure to show all your work.<br />Claude kept track of what he saw at Point Defiance Zoo. He saw twice as many sharks as dolphins. The number of whales was 6 less than the number of sharks. There were 5 times as many sea lions as there were whales. He saw 20 sea lions. How many did he see altogether? <br />On the quiz show "What Do You Know?" each question is worth four times as much as the previous question. The fourth question is worth $I,600. How much was the first question worth? <br />Add 5 to the mystery number. Then subtract 7. The result is 23. What is the mystery number?<br />Tracy asked her dad how old he was. He told her, “If I add 10 to my age and double the result, I will get 84.” How old is Tracy’s dad?<br />Name _____________________Date ___________<br />Mrs. Labuski & Mrs. Portsmore Per __Work Backwards<br />METHOD 6 –Work Backwards:<br />Some problems give you a sequence of information and ask you to find something that happened at the beginning. To solve a problem like this, you may want to start at the end of the problem and work backwards.<br />Let’s try one: Lucy wants to take a 4:45 bus. It takes her 20 minutes to get to the bus station. She wants to get there 20 minutes early. What time should she leave for the bus station?<br />
    • UNDERSTANDFacts4:45 bus 20 minutes to get to stationwants to get there 20 minutes early QuestionWhat time should she leave for the bus station?PLANStrategyWork BackwardsSOLVE 4:45 bus - 20 minutes to get there 4:25- 20 minutes early 4:05 She should leave at 4:05 for the bus station.CHECK4:05 she leaves+ 20 travel4:25+ 20 early4:45 bus
    Jesse was out playing golf last Thursday. On the first six holes, he lost 4 golf balls. On the next six holes he lost one half of the number of golf balls he had then. On the last six holes, he only lost 2 more golf balls. He finished with 4 golf balls. How many did he start with? <br />
    • UNDERSTANDFactsfirst six holes, he lost 4 golf balls. next six holes he lost one half of the number of golf balls he had then. last six holes, he only lost 2 more golf balls. finished with 4 golf balls. QuestionHow many did he start with? PLANStrategyWork BackwardsSOLVEEnded with: 4 ballsLast 6 lost +2 balls 6 ballsMiddle 6 lost half +6 balls 12 ballsFirst 6 lost 4 +4 balls 16 balls He started with 16 ballsCHECK 16 balls to start- 4 lost on first 612 balls-6 balls (lost half) 6 balls-2 balls lost on last 6 4 balls
    Name _____________________Date ___________<br />Mrs. Labuski & Mrs. Portsmore Per __Work Backwards HW<br />Use the four-step problem solving method to solve the following. Draw the Four-Step Square on loose-leaf and be sure to show all your work.<br />Claude kept track of what he saw at Point Defiance Zoo. He saw twice as many sharks as dolphins. The number of whales was 6 less than the number of sharks. There were 5 times as many sea lions as there were whales. He saw 20 sea lions. How many did he see altogether? <br />On the quiz show "What Do You Know?" each question is worth four times as much as the previous question. The fourth question is worth $1,600. How much was the first question worth? <br />Add 5 to the mystery number. Then subtract 7. The result is 23. What is the mystery number?<br />Tracy asked her dad how old he was. He told her, “If I add 10 to my age and double the result, I will get 84.” How old is Tracy’s dad?<br />Question 1<br />
    • UNDERSTANDFactsQuestion PLANStrategyWork BackwardsSOLVECHECK
    Question 2<br />
    • UNDERSTANDFactsQuestion PLANStrategyWork BackwardsSOLVECHECK
    Question 3<br />
    • UNDERSTANDFactsQuestion PLANStrategyWork BackwardsSOLVECHECK
    Question 4<br />
    • UNDERSTANDFactsQuestion PLANStrategyWork BackwardsSOLVECHECK