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Study for Your GED Math Test

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Learn more about percentages here.

How do I ...
Change from a percent number to a decimal number?
Move the decimal point left two positions.

How do I ...
Change from a decimal number to a percent number?
Move the decimal point right two positions.

How do I ...
Grade my own work?
To grade your own work: Get the answer key and score each problem right or wrong. Write the result at the top like this: 20/30 (where the denominator is the number of problems). Substitute the actual numbers of course!
Now comes the division. Thirty goes into twenty how many times?
.67 (I rounded!)
Finally change the decimal number (.67) to a percent number (67%) by moving the decimal point right, two places.
Add the percent sign of course: 67% correct

Percent Exercises

  1. Convert 15% to a decimal number.
  2. Convert 25% to a decimal number.
  3. Convert 100% to a decimal number.
  4. Convert 57% to a decimal number.
  5. Convert 145% to a decimal number.
  6. Convert .35% to a decimal number.
  7. Write .78 as a percent.
  8. Write 8 as a percent.
  9. Write .0325 as a percent.
  10. Find 45% of 125.
  11. The number 5.25 is what percent of 35?
  12. 32 if 40% of what number?
  13. 70% of 30 students passed. How many is that?
  14. What is 14.4% of 9432?
  15. What is 35% of 8950?
  16. What is 30% of 9432?
  17. What is the difference between the two answers above?
    (Grade yourself: Figure the answers, up to here, from this web page.)
  18. Convert 82% to a decimal number.
  19. Convert 325% to a decimal number.
  20. Write .64 as a percent.
  21. Write .0003 as a percent.
  22. 54 is 60% of what number?
  23. 50.4 is what percent of 120?
  24. A couch costs $800 and now it's 45% off. How much money do you save?
  25. Concerning the same couch, what is the sale price?
  26. A shirt used to cost $20 and now it costs $15. What is the percent decrease?
  27. Find the percent of 280/1200.
  28. The restaurant bill is $30. The tax is 9.5%. The tip is 10% of the first two. What is the total cost?
  29. What is 7% of 5000?
    (Grade yourself: Figure the remaining answers from this web page.)
  30. Grade this yourself and calculate the percent you got right. (OK, give yourself one correct for this problem too. I'm just counting on you to get it right.)