Problema Solution
At the grocery store, you buy a carton of milk for $3.90, a loaf of bread for $1.95, and a bag of cookies for $3.05. Use mental math to find the total cost of the groceries.
Answer provided by our tutors
we round 3.90 to 4
we round 1.95 to 2
we found 3.05 to 3
4+2+3 = 9
we notice that we can knock 0.10 off the total for the bread and that the nickel less and more for the break and cookies cancel, therefore the price is $8.90