Lesson 13
Using Decimals in a Shopping Context
Let’s use what we know about decimals to make shopping decisions.
Problem 1
Mai had $14.50. She spent $4.35 at the snack bar and $5.25 at the arcade. What is the exact amount of money Mai has left?
$9.60
$10.60
$4.90
$5.90
Problem 2
A large cheese pizza costs $7.50. Diego has $40 to spend on pizzas. How many large cheese pizzas can he afford? Explain or show your reasoning.
Problem 3
Tickets to a show cost $5.50 for adults and $4.25 for students. A family is purchasing 2 adult tickets and 3 student tickets.
 Estimate the total cost.
 What is the exact cost?
 If the family pays $25, what is the exact amount of change they should receive?
Problem 4
Chicken costs $3.20 per pound, and beef costs $4.59 per pound. Answer each question and show your reasoning.

What is the exact cost of 3 pounds of chicken?

What is the exact cost of 3 pound of beef?

How much more does 3 pounds of beef cost than 3 pounds of chicken?
Problem 5
 How many \(\frac15\)liter glasses can Lin fill with a \(1 \frac12\)liter bottle of water?
 How many \(1 \frac12\)liter bottles of water does it take to fill a 16liter jug?
Problem 6
Let the side length of each small square on the grid represents 1 unit. Draw two different triangles, each with base \(5\frac12\) units and area \(19\frac14\) units^{2}.
Why does each of your triangles have area \(19\frac14 \text{ units}^2\)? Explain or show your reasoning.
Problem 7
Find each quotient.
 \(\frac56 \div \frac16\)
 \(1\frac16 \div \frac{1}{12}\)
 \(\frac{10}{6 }\div \frac{1}{24}\)