Question

beatrice is taking inventory of the furniture in an office building she owns. each office has the same number of chairs and beatrice wants to know the total number of chairs in the offices in the building. choose the action that beatrice should use to do this calculation.
chairs per offices (chairs/office)
offices (offices)
use conversion factor
total chairs (chairs)
alyssa want to estimate how and bake a cake. choose the action that alyssa should use to do this calcula
preparation time (min)
add
baking time (min)
subtract
make conversion factor
use conversion factor
ne (min)
ellen has a set amount of money to spend on holiday presents for her family and wants to spend the same amount of money on each family member. choose the action that ellen should use to calculate how much money she can spend on each family member
money to spend ($)
money per family member ($/person)
number of family members (people)
lois is mailing a package and needs to pay for the stamp to mail the package along with the fee to send it certified mail. choose the action that lois should use to do this calculation.
certified mail fee ($)
add
total charge ($)
cost of stamp ($)

Explanation:

Step1: Beatrice's calculation logic

To find total chairs, multiply chairs per office (a conversion factor) by number of offices: $\text{Total chairs} = \frac{\text{chairs}}{\text{office}} \times \text{offices}$. This uses a conversion factor.

Step2: Alyssa's calculation logic

Total time for cake is preparation + baking time: $\text{Total time} = \text{Preparation time} + \text{Baking time}$. So use add.

Step3: Ellen's calculation logic

To find money per family member, divide total money by number of people: $\text{Money per person} = \frac{\text{Total money}}{\text{Number of people}}$. This is equivalent to using a conversion factor (or division, which fits the "make conversion factor" logic, but more accurately, we use division as a conversion of total dollars to dollars per person).

Step4: Lois's calculation logic

Total charge is certified fee + stamp cost: $\text{Total charge} = \text{Certified mail fee} + \text{Cost of stamp}$. So use add.

Answer:

1. Beatrice: use conversion factor
2. Alyssa: add
3. Ellen: make conversion factor (or division, framed as a conversion factor)
4. Lois: add