Strategy 1: Guess and Check

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Presentation transcript:

Strategy 1: Guess and Check Guess an answer then test to see if it correct. Move closer and closer to an answer. Can be used first as a starter, then another strategy can be used. When the problem needs one solution. Helpful when there is many pieces of data or large numbers.

Strategy 1: Guess and Check Example: How many minutes did Heidi, Saul, and Joy each travel to get to the skating rink on Saturday? Joy came by skateboard, Heidi came by bike, and Saul came on the bus. It took Heidi twice as long as Joy to get there. It took Saul 10 minutes more than it took both the girls together. All three skaters together took 64 minutes to get to the rink.

Strategy 1: Guess and Check How many minutes did Heidi, Saul, and Joy each travel to get to the skating rink on Saturday? Joy came by skateboard, Heidi came by bike, and Saul came on the bus. It took Heidi twice as long as Joy to get there. It took Saul 10 minutes more than it took both the girls together. All three skaters together took 64 minutes to get to the rink. Step 1: Find Out What is the question you have to answer? What do you know about Heidi’s travelling time? What do you know about Joy’s travelling time? What do you know about Saul’s travelling time? How long did it take all three skaters together to get to the rink?

Strategy 1: Guess and Check How many minutes did Heidi, Saul, and Joy each travel to get to the skating rink on Saturday? Joy came by skateboard, Heidi came by bike, and Saul came on the bus. It took Heidi twice as long as Joy to get there. It took Saul 10 minutes more than it took both the girls together. All three skaters together took 64 minutes to get to the rink. Step 2: Choose a Strategy Will guessing an answer help you to solve this problem? How can you use the information from an incorrect guess?

Strategy 1: Guess and Check How many minutes did Heidi, Saul, and Joy each travel to get to the skating rink on Saturday? Joy came by skateboard, Heidi came by bike, and Saul came on the bus. It took Heidi twice as long as Joy to get there. It took Saul 10 minutes more than it took both the girls together. All three skaters together took 64 minutes to get to the rink. Step 3: Find Out Would you start by making a guess for Heidi, Saul or Joy? Why? What is your guess? If you make a guess for one skater, can you figure out the time taken by the other two skaters? How can you check your guess? How was your guess? If your first guess was wrong, how can you use the information to make your next guess?

Strategy 1: Guess and Check How many minutes did Heidi, Saul, and Joy each travel to get to the skating rink on Saturday? Joy came by skateboard, Heidi came by bike, and Saul came on the bus. It took Heidi twice as long as Joy to get there. It took Saul 10 minutes more than it took both the girls together. All three skaters together took 64 minutes to get to the rink. Step 4: Look Back Read the problem again. Look at the data, conditions, and the main question. Review your work. Is the answer reasonable?