Your Math class has 32 students. You would like to treat the class to cookies. You would like each person to have 5 cookies. Which expression would be a quick way to figure out how many cookies you would need to bake?

5(32 + 2)

5(30 + 2)

5(32 − 2)

5(30 − 2)

Question

Your Math class has 32 students. You would like to treat the class to cookies. You would like each person to have 5 cookies. Which expression would be a quick way to figure out how many cookies you would need to bake?

 5(32 + 2)

 5(30 + 2)

 5(32 − 2)

 5(30 − 2)

phi · Answer

if it were 1 student the answer is 5 cookies
2 then 5+5 =10
3 then 5+5+5= 15
4 then 5+5+5+5= 20
it looks like 5 times the number of students.  so
5*32
none of the answers look like that... but let's add the numbers inside the parentheses:
5(32+2)= 5*34   that is not right.  Try the rest of them...