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    • What is a percent?
    • How to find the percent of a number?
  1. Evaluate without using a calculator. Then, check your answers with a calculator.
    1. 15% of 40
    2. 320% of 600
    3. 17.5% of 20
    4. 201420\frac{1}{4}% of 50
  2. The total rain precipitation of last summer was 350 mm. If it increased by 121212\frac{1}{2}% this summer, what was the rain precipitation this summer?
    Topic Notes
    In this section, we will try to estimate the percent of a number without using a calculator. The trick is to breakdown the percent into smaller percent first. These smaller percentages are easier for mental calculation.