Performance Tasks Performance Task 1: Comparing Freezing Points (7.NS.A.1) Ocean water freezes at about -2 ½ water freezes at 0 . Antifreeze, a liquid ˚C. Fresh ˚C used in the radiators of cars, freezes at -64 . ˚C Imagine that the temperature has dropped to the freezing point for ocean water. How many degrees more must the temperature drop for the antifreeze to turn solid? Explain your reasoning. Operations on the Number Line (7.NS.A.1) A number line is shown below. The numbers 0 and 1 are marked on the line, as are two other numbers a and b. Which of the following numbers is negative? Choose all that apply. Explain your reasoning. a. a 1 – b. a 2 − c. –b d. a + b e. a b − f. ab + 1 Solution: Comparing Freezing Points
Performance Tasks Performance Task 1: Comparing Freezing Points (7.NS.A.1) Ocean water freezes at about -2 ½ ˚C. Fresh water freezes at 0 ˚C . Antifreeze, a liquid used in the radiators of cars, freezes at -64 ˚C . Imagine that the temperature has dropped to the freezing point for ocean water. How many degrees more must the temperature drop for the antifreeze to turn solid? Explain your reasoning. Operations on the Number Line (7.NS.A.1) A number line is shown below. The numbers 0 and 1 are marked on the line, as are two other numbers a and b. Which of the following numbers is negative? Choose all that apply. Explain your reasoning. a. a – 1 b. a − 2 c. –b d. a + b e. a − b f. ab + 1 Solution: Comparing Freezing Points
7th%20Grade%20Unit%201%202014-2015_final.docx