Trade Statistics


MATH – Use these statistics to calculate percent increase or decrease for mathematics. You can also use these trade statistics to see what these numbers can reveal about a historical time period.

Questions for Social Studies:

  1. Explain the impact of the move from sail to steam on trade.
  2. What can you learn about the economy and the Great Depression’s effect on trade from these primary sources?

For Math, calculate percentage increase or decrease:

  1. First, find the difference between the two numbers.
  2. Take the difference and divide it by the original number.
  3.  Finally, multiply that number by 100.

    Trade Statistics

    Statistics from a Merchant Marines, Department of Commerce book, SSHSA Archives.

    Trade Statistics

    Statistics from a Merchant Marines, Department of Commerce book, SSHSA Archives.

Additional Resources

Simple Percent Increase Calculator.

Learn more about histograms in statistics from PBS.

Education Standards

National Council for Social Studies

National Council of Teachers of Mathematics

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.