Percent Increase/Decrease and Percent Error. Cassandra likes rings. She currently has 5 rings in her collection. – Draw a double number line diagram relating.

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Presentation transcript:

Percent Increase/Decrease and Percent Error

Cassandra likes rings. She currently has 5 rings in her collection. – Draw a double number line diagram relating the number of rings as a percent of the whole set of rings. – What percent is represented by the whole collection of rings? – What percent of the collection does each ring represent?

Cassandra’s aunt said she will buy Cassandra another ring for her birthday. If Cassandra gets the ring for her birthday, what will be the percent increase in her ring collection? 0%100% increase 120%

Jon increased his trading card collection by 5 cards. He originally had 15 cards. What is the percent increase? Suppose instead of increasing the collection by 5 cards, John increased his 15-card collection by just 1 card. Will the percent increase be the same as when Cassandra’s ring collection increased by 1 ring (in Example 1)? Why or why not? Explain.

Formula For Percent Increase/Decrease and Percent Error

Ken said that he is going to reduce the number of calories that he eats during the day. Ken’s trainer asked him to start off small and reduce the number of calories by no more than 7%. Ken estimated and consumed 2,200 calories per day instead of his normal 2,500 calories per day until his next visit with the trainer. Did Ken reduce his calorie intake by 7%? Justify your answer.

How many calories would Ken need to consume for an exact change in calories of 7%? (he normally eats 2,500)

“The value of an investment decreased by 10%. The original amount of the investment was $75. What is the current value of the investment?”

Justin earned 8 badges in Scouts as of the Scout Master’s last report. Justin wants to complete 2 more badges so that he will have a total of 10 badges earned before the Scout Master’s next report. – a. If Justin completes the additional 2 badges, what will be the percent increase in badges? – b. Express the 10 badges as a percent of the 8 badges. – c. Does 100% plus your answer in part (a) equal your answer in part (b)? Why or why not?

A realtor expected 18 people to show up for an open house, but 25 attended. What is the percent error of the realtor’s prediction?

In science class, Mrs. Moore’s students were directed to weigh a 300 gram mass on the balance scale. Tina weighed the object and reported 328 grams. What was the percent error of Tina’s measurement?

Darwin’s coach recorded that he had bowled 250 points out of 300 in a bowling tournament. However, the official scoreboard showed that Darwin actually bowled 225 points out of 300. What was the percent error the coach made?

The veterinarian weighed Oliver’s new puppy, Boaz, on a defective scale. He weighed 36 pounds. However, Boaz weighs exactly 34.5 pounds. What is the percent of error in measurement of the defective scale to the nearest tenth?

Erin wants to raise her math grade to a 95 to improve her chances of winning a math scholarship. Her math average for the last marking period was an 81. Erin decides she must raise her math average by 15% to meet her goal. Do you agree? Why or why not? Support your written answer by showing your math work. – (hint: not 15 points, 15% of her current math average)