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This lab allows students to practice their skills with the multiplication and division of decimals in a real world situation. Using a menu from a pizza house, students will determine the cost per unit area of the pizzas to determine the best buy. In addition they will decide whether it is better to buy the combo pizza or add toppings to a cheese pizza, and if it is a better deal to buy two medium pizzas or one extra large. See the 1st entry under Comments for Terrie Teegarden's recommendation re this activity.
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San Diego Mesa College
Topic: Arithmetic operations with decimals
Context: Group Work, Homework, Take-Home Quiz, In-Class Activity
Multiplication and division of decimals, Rounding of decimals,
Area of a circle and the meaning of Pi
Time required: 30 minutes
Materials: Menus from local pizza places are optional
• Although the formula of a circle is given, the instructor might want to explain its use if the students have not seen it before.
• Since this is a pre- algebra activity, it is recommended that the students use 3.14 as an approximation for pi and do all the calculations by hand.
Follow Up/Discussion Questions:
• Students can repeat the activity using the menu from their favorite pizza place.