If 20 students each require 12 ounces of plaster for an impression, how many pounds of plaster are needed in total?

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Master the Certify Teacher EC-6 (391) Mathematics Test. Use flashcards and multiple choice questions with explanations. Boost your confidence and excel in your exam!

Multiple Choice

If 20 students each require 12 ounces of plaster for an impression, how many pounds of plaster are needed in total?

Explanation:
Convert the total from ounces to pounds. Multiply 20 by 12 to get 240 ounces. Since 1 pound is 16 ounces, divide 240 by 16 to convert to pounds: 240 ÷ 16 = 15. So the total plaster needed is 15 pounds. A quick check: 16 × 15 = 240 confirms the conversion is correct.

Convert the total from ounces to pounds. Multiply 20 by 12 to get 240 ounces. Since 1 pound is 16 ounces, divide 240 by 16 to convert to pounds: 240 ÷ 16 = 15. So the total plaster needed is 15 pounds. A quick check: 16 × 15 = 240 confirms the conversion is correct.

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