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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. 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?






2. There are 10 finalists for the school spelling bee. A first - second - and third place trophy will be awarded. In how many ways can the judges award the 3 prizes?






3. What is the name for a grouping of the members within a set based on a shared characteristic?






4. What are the real numbers?






5. What is the side length of an equilateral triangle with altitude 6?






6. Which quadrant is the upper left hand?






7. If 10800 is invested at a simple interest rate of 4% - what is the value of the investment after 18 months?






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






9. 7/8 in percent?






10. Whats the difference between factors and multiples?






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






12. 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?






13. What are congruent triangles?






14. Can the input value of a function have more than one output value (i.e. x: y - y1)?






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






16. 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






17. To multiply a number by 10^x






18. What is a minor arc?

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






20. What are the integers?






21. 20<all primes<30






22. 1/2 divided by 3/7 is the same as






23. Legs 6 - 8. Hypotenuse?






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






25. Evaluate 4/11 + 11/12






26. What is a set with no members called?






27. a^2 + 2ab + b^2






28. 200 <_ x <_ 300. How many values of x are divisible by 5 & 8?






29. What are the irrational numbers?

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30. (-1)^2 =






31. Suppose that the graph of f(x) is the result of stretching y=x + 5 away from the x-axis by a factor of 2. What is the new equation for the graph f(x)?






32. What percent of 40 is 22?






33. How to find the circumference of a circle which circumscribes a square?






34. 5x^2 - 35x -55 = 0






35. Simplify 4sqrt21 X 5sqrt2 / 10sqrt7






36. a^2 - 2ab + b^2






37. What is the 'domain' of a function?






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






39. What is a finite set?






40. A company places a 6-symbol code on each product. The code consists of the letter T - followed by 3 numerical digits - and then 2 consonants (Y is a conson). How many codes are possible?






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






42. 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?






43. What is a chord of a circle?






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






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






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






47. Formula for the area of a circle?






48. When does a function automatically have a restricted domain (2)?






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






50. How many 3-digit positive integers are even and do not contain the digit 4?







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