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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. 5/6 in percent?






2. If you have a set of n objects - but you only want to order k of them - what formula do you use to determine the number of permutations?






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






4. If a=-1 and b=3 - what is the value of (4(a^3)(b^2) - 12(a^2)(b^5)) / (16(a^3)(b^2))?






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






6. Formula to calculate arc length?






7. Order of quadrants:






8. The objects in a set are called two names:






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






10. 10<all primes<20






11. Which quadrant is the lower left hand?






12. Legs: 3 - 4. Hypotenuse?






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






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






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






16. What are the smallest three prime numbers greater than 65?






17. Factor x^2 - xy + x.






18. Factor a^2 + 2ab + b^2






19. 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






20. Formula for the area of a circle?






21. A number is divisible by 9 if...






22. What is the graph of f(x) shifted upward c units or spaces?






23. Surface area for a cylinder?






24. 0^0






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






26. 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?






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






28. In a triangle where the two legs are 4 and 3 - what is the value of a line directly intersecting the middle coming from the meeting point of the two legs?






29. What is the set of elements which can be found in either A or B?






30. Which quadrant is the upper left hand?






31. A number is divisible by 3 if ...






32. What is the 'Solution' for a system of linear equations?






33. A number is divisible by 6 if...






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






35. What is an isoceles triangle?






36. (x^2)^4






37. Evaluate 4/11 + 11/12






38. Describe the relationship between 3x^2 and 3(x - 1)^2






39. (6sqrt3) x (2sqrt5) =






40. What is the surface area of a cylinder with radius 5 and height 8?






41. Define an 'expression'.






42. 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?






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






44. How to find the area of a sector?






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






46. Define a 'Term' -






47. Whats the difference between factors and multiples?






48. 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?






49. What is a chord of a circle?






50. a^2 + 2ab + b^2