N3C7TNp45

Answer to Problem 45:

1. Students should be encouraged to use benchmarks as they do mental math.  In this problem, the distributive property can serve as an aid in getting the solution.  $1.50 can be broken down as .   and of 6 is 3.  So I know that we are going to add $6 + $3 = $9 for the total cost of the hamburger.
2. 1.5 x 6 = 9