Sheet # 8/Critical Thinking/Wrapping Paper
Name: _____________________ Date_____________
Use drawings, words, or numbers to explain how you got your answer.
Jackie is trying to wrap a present for her brother. The present, a car, is in a box that is twelve inches long, six inches wide, and 3 inches high. Which piece of wrapping paper should Jackie use - one that is 25 inches by 10 inches, or one that is 20 inches by 15 inches?
Answer for sheet # 8
Calculate the surface area of the box.
12 inches x 6 inches = 72 square inches. There are two sides. Total area = 72 x 2 = 144 sq. inches
12 inches x 3 inches = 36 square inches. There are two sides. Total area = 36 square inches x 2 = 72 sq. inches.
6 inches x 3 inches = 18 inches. There are two sides. Total area = 18 x 2 = 36 sq. inches
Total surface area = 144 + 72 + 36 = 252 square inches
Paper size:
25 inches x 10 inches = 250 sq. inches.
20 inches x 15 inches = 300 sq. inches
You will choose 20 inches x 15 inches paper