Math Practice 101
Homework Explained - Math Practice 101

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Grade 7 McGraw Hill Glencoe - Answer Keys
Chapter 2: Percents; Lesson 5: Percent of Change


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  • Question 11 (request help)

    Refer to the rectangle at the right. Suppose the side lengths are doubled.

    a. Find the percent of change in the perimeter
  •    \(\large \text{ %}\)
  • Question 11 (request help)

    b. Find the percent of change in the area.
  •    
  • Question 12 (request help)

    Use Math Tools Find examples of data reflecting change over a period of time in a newspaper or magazine, on television, or on the Internet. Determine the  percent of change. Explain whether the data show a percent of increase or decrease.
  • Question 13 (request help)

    Use the graph shown to find the percent of change in CD sales from 2011 to 2012.
  •    \(\large \text{ %}\)

H.O.T. Problems Higher Order Thinking

  • Question 14 (request help)

    Persevere with Problems The costs of two sound systems were decreased by $10. The original costs of the systems were $90 and $60. Without calculating, which had a greater percent of decrease? Explain.
    • $60
    • $90
  • Question 15 (request help)

    Find the Error Dario is finding the percent of change from $52 to $125. Find his mistake and correct it.
  • Question 16 (request help)

    Reason Inductively If a quantity increases by 25% and then decreases by 25%, will the result be the original quantity? Explain.
    • yes
    • no

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