Name Date Chapter 3 Performance Task Oops! Unit Conversion Mistakes Why is accuracy in unit conversions important? In what types of situations can mistakes in unit conversions cause problems? 1. A patient is scheduled to receive 750 milliliters of blood over the course of 4.5 hours. There are 15 drops in 1 milliliter. The nurse is supposed to find the correct rate, in drops per minute, of the transfusion so that the patient's circulatory system is not over- or under-taxed. The nurse makes the following calculation. 750 mL 15 drops =2500- drops 4.5 h 1 mL min The nurse made one very dangerous mistake. What is it? Find the correct rate. 2. In July of 1983, an Air Canada flight took off from Montreal. After one hour, the plane ran out of fuel and had to make an emergency landing. Before the flight, the aircraft personnel determined that the plane needed 22,300 total kilograms of fuel for the flight and that there was currently 7682 liters of fuel in the tank. They determined that the plane would need 4917 more liters of fuel by performing the following calculations. Weight of fuel in the tank: 7682 L x 1.77 - = 7T = 13,597 kg Weight of fuel to be added: 22,300 kg - 13,597 kg = 8703 kg Volume of fuel to be added: 5703 kg 1.77 1b " = 4917 L What did they do wrong? Find the correct amount (in liters) of fuel to be added. (1 kg = 2.2 1b) Name Date Chapter 3 Performance Task (continued) Oops! Unit Conversion Mistakes 3. A doctor prescribes a baby a dose of 0.75 milliliter of a liquid medication twice a day for two weeks. a. Describe a mistake the pharmacist could make when converting to teaspoons (1 tsp = 4.9 ml). b. Using the mistake, how many milliliters of medication will the baby take during two weeks? c. According to the doctor, how many milliliters of medication is the baby supposed to take during two weeks? 4. In February 2001, the Los Angeles Zoo let the Exotic Animal Training and Management Program at Moorpark College in California care for and observe the zoo's 75-year-old Galapagos tortoise, Clarence. The zoo asked the college to build a home for the tortoise, saying that he weighed "about 250." The college did just that, and the first night Clarence pushed the fence poles of his enclosure over. a. Clarence weighed 250 kilograms, not pounds as the college caretakers assumed. How many pounds did Clarence actually weigh? b. Assume Clarence weighed 0. 1 pound at birth. What is Clarence's growth rate in pounds per year? Big Ideas Math: Modeling Real Life Grade 6 Copyright @ Big Ideas Learning, LLC Assessment Book All rights reserved
