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GRE Math: Common Errors

Subjects : gre, math
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Simplify 4sqrt21 X 5sqrt2 / 10sqrt7






2. P and r are factors of 100. What is greater - pr or 100?






3. To convert a percent to a fraction....






4. What are 'Supplementary angles?'






5. The perimeter of a square is 48 inches. The length of its diagonal is:






6. Formula to calculate arc length?






7. Ratio of ages of Anna and Emma is 3:5 and of Emma and Nicolas is 3:5. What is the ratio of Anna to Nicholas' ages?






8. 1/8 in percent?






9. 413.03 x 10^(-4) =






10. A cylinder has a surface area of 22pi. If the cylinder has a height of 10 - what is the radius?






11. Suppose you have a set of n objects - and you want to select k of them - but the order doesn'T matter. What formula do you use to determine the number of combinations of n objects taken k at a time?






12. Nine coins are tossed simultaneously. In how many of the outcomes will the fourth coin tossed show heads?






13. What percent of 40 is 22?






14. Simplify 9^(1/2) X 4^3 X 2^(-6)?






15. How to find the diagonal of a rectangular solid?






16. Simplify the expression (p^2 - q^2)/ -5(q - p)






17. Describe the relationship between the graphs of x^2 and (1/2)x^2






18. What transformation occurs if point C is reflected over the x-axis and then the y-axis?






19. How many sides does a hexagon have?






20. Which is greater? 64^5 or 16^8






21. Evaluate 3& 2/7 / 1/3






22. 5/8 in percent?






23. If 8 schools are in a conference - how many games are played if each team plays each other exactly once?






24. What is a finite set?






25. Convert 0.7% to a fraction.






26. What is the set of elements found in both A and B?






27. What number between 70 & 75 - inclusive - has the greatest number of factors?






28. What does the graph (x+2)^2 + (y+2)^2 = 9 look like?






29. Find the surface area of a cylinder with radius 3 and height 12.






30. Simplify (a^2 + b)^2 - (a^2 - b)^2






31. What is the ratio of the sides of a 30-60-90 triangle?






32. 1/6 in percent?






33. The larger the absolute value of the slope...






34. The slope of a line perpendicular to (a/b)?






35. Pi is a ratio of what to what?

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36. What are the irrational numbers?

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37. If the 80th percentile of the measurements is 72degrees - about how many measurments are between 69 degrees and 72 degrees? Round your answer to the nearest tenth






38. 1:sqrt3:2 is the ratio of the sides of what kind of triangle?






39. A brick with dimensions 10. 15 and 25 weighs 1.5 kg. A second brick (same density) has dimensions 12 - 18 - and 30. What is the weight of the second brick?






40. 5 bakeries sell an average of 300 muffins per bakery per day. If 2 stop making muffins but the total muffins sold stays the same - what is the average of muffins per bakery sold among the remaining?






41. x^4 + x^7 =






42. Can the output value of a function have more than one input value?






43. What does scientific notation mean?






44. Legs 6 - 8. Hypotenuse?






45. (a^-1)/a^5






46. Factor x^2 - xy + x.






47. What are the members or elements of a set?






48. What is the 'Restricted domain of a function'?






49. How many multiples does a given number have?






50. What is the empty set?