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Lesson: Applied Arithmetic - 03

Percent Change

[Page 3 of 36]
Percentage Change is all about comparing old to new values.
  • Step 1: Calculate the change (subtract old value from the new value)
  • Step 2: Divide that change by the old value (you will get a decimal number)
  • Step 3: Convert that to a percentage (by multiplying by 100 and adding a "%" sign)
Note: if the new value is greater then the old value, it is a percentage increase, otherwise it is a decrease.

Video lesson on percent decrease

Where test-takers tend to get confused (as the test-maker well knows) is on Percent Change problems. However, these problems can be easy points for you, once you know how to set them up.

Percent Change = .

If you're ever confused about what the "original" amount is, note:

Percent increase (or greater) =

Percent decrease (or less) =

Video Lesson on Percent Increase

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