Question

for each of the situations below, choose the action that will make the calculation work.
in each case, the units for each input and the result are given in parentheses ().
if you dont know what make a conversion factor and use a conversion factor mean in the pull - down menus, click the check answers button and read the concepts lesson.
steve wants to buy several pints of strawberries and sees that they are on sale for a good price. choose the action that steve should use to calculate the total cost of the strawberries.
cost per pint ($/pint)
pints bought (pints)
total cost ($)
gavin wants to calculate how much air pressure he lost in his tires after he drove from denver to houston. choose the action that gavin should use to do this calculation.
tire pressure in de
tire pressure in ho
air pressure lost (psi)
alyssa want to est to prepare and bake a cake. choose the action that alyssa should use to do th
baking time (min)
preparation time (min)
total time (min)
a teacher has a big sheet of stickers to share with her classroom and wants to know how many stickers each child will get if they are shared equally. choose the action that the teacher should use to do this calculation.
students (students)
total stickers (stickers)
stickers per student (stickers/student)

Explanation:

Step1: Calculate total strawberry cost

Total cost = Cost per pint × Pints bought. This uses multiplication (equivalent to treating cost per pint as a conversion factor to convert pints to dollars, so we use the "make conversion factor" action to multiply the two values).

Step2: Calculate lost tire pressure

Pressure lost = Denver pressure - Houston pressure, so we use the "subtract" action.

Step3: Calculate total cake time

Total time = Baking time + Preparation time, so we use the "add" action.

Step4: Calculate stickers per student

Stickers per student = $\frac{\text{Total stickers}}{\text{Students}}$. This uses division (equivalent to making a conversion factor from total students to find per-student stickers, so we use the "make conversion factor" action to divide total stickers by number of students).

Answer:

1. Steve's calculation: make conversion factor
2. Gavin's calculation: subtract
3. Alyssa's calculation: add
4. Teacher's calculation: make conversion factor