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.
kendra had a growth spurt and wants to calculate how much shes grown since last year. choose the action that kendra should use to do this calculation.
kendras height now (cm)
kendras height last year (cm)
how much kendra grew (cm)
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)
total chairs (chairs)
alyssa want to estimate how long it will take her in total to prepare and bake a cake. choose the action that alyssa should use to do this calculation.
preparation time (min)
baking time (min)
total time (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 ($)
number of family members (people)
money per family member ($/person)
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.

Explanation:

Step1: Find growth via subtraction

$\text{Growth (cm)} = \text{Current height (cm)} - \text{Last year's height (cm)}$

Step2: Find total chairs via multiplication

$\text{Total chairs} = \text{Chairs per office} \times \text{Number of offices}$

Step3: Find total time via addition

$\text{Total time (min)} = \text{Preparation time (min)} + \text{Baking time (min)}$

Step4: Find money per member via division

$\text{Money per member (\$/person)} = \frac{\text{Total money to spend (\$)}}{\text{Number of family members (people)}}$

Step5: Find total postage via addition

$\text{Total cost} = \text{Stamp cost} + \text{Certified mail fee}$

Answer:

1. Kendra: Subtraction ($-$)
2. Beatrice: Multiplication ($\times$)
3. Alyssa: Addition ($+$)
4. Ellen: Division ($\div$)
5. Lois: Addition ($+$)