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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. Formula for the area of a sector of a circle?






2. What percent of 40 is 22?






3. (-1)^3 =






4. Can you subtract 3sqrt4 from sqrt4?






5. What are 'Supplementary angles?'






6. Area of a triangle?






7. 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?






8. Simplify 4sqrt21 X 5sqrt2 / 10sqrt7






9. x^4 + x^7 =






10. There are 10 finalists for the school spelling bee. A first - second - and third place trophy will be awarded. How many different people can get the three prizes?






11. 5/8 in percent?






12. How to find the area of a sector?






13. What is the ratio of the sides of an isosceles right triangle?






14. Which quadrant is the lower left hand?






15. Factor x^2 - xy + x.






16. Order of quadrants:






17. 10<all primes<20






18. What is the common monomial factor in the expression 4(c^3)d - (c^2)(d^2) + 2cd?






19. In similar hexagons - the ratio of the areas is 16:25. What is the ratio of their corresponding sides?






20. a^2 + 2ab + b^2






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






22. Simplify the expression [(b^2 - c^2) / (b - c)]






23. 200 <_ x <_ 300. How many values of x are divisible by 5 & 8?






24. The number of degrees in the largest angle of a triangle inscribed in a circle - in which the diameter of the circle is one side of the triangle.






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






26. In a triangle inscribed inside a circle - where the diameter is one side of the triangle - which angle is largest?






27. What are the irrational numbers?

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






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






30. If the two sides of a triangle are unequal then the longer side...






31. What is the sum of the angles of a triangle?






32. Hector invested $6000. Part was invested in account with 9% simple annual interest - and the rest in account with 7% simple annual interest. If he earned $490 in the first year of these investments - how much did he invest in each account?






33. Which quadrant is the upper right hand?






34. What is the percent formula?






35. Define an 'expression'.






36. What is a tangent?






37. 3/8 in percent?






38. What is the area of a regular hexagon with side 6?






39. 50 < all primes< 60






40. Write 10 -843 X 10^7 in scientific notation






41. a^2 - b^2






42. Legs 6 - 8. Hypotenuse?






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






44. Formula to find a circle'S circumference from its diameter?






45. How many sides does a hexagon have?






46. What is the formula for computing simple interest?






47. Volume for a cylinder?






48. What does the graph x^2 + y^2 = 64 look like?






49. 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?






50. x^2 = 9. What is the value of x?