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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. (6sqrt3) x (2sqrt5) =






2. 10<all primes<20






3. Circumference of a circle?






4. Legs: 3 - 4. Hypotenuse?






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






6. What is the name of set with a number of elements which cannot be counted?






7. 1/8 in percent?






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






9. 4.809 X 10^7 =






10. 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?






11. 5x^2 - 35x -55 = 0






12. What is the ratio of the surface area of a cube with an edge of 10 to the surface area of a rectangular solid with dimensions 2 - 4 - and 6?






13. 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?






14. What are the real numbers?






15. 0^0






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






17. What is a major arc?

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






19. For similar triangles - the ratio of their corresponding sides is 2:3. What is the ratio of their areas?






20. (-1)^2 =






21. If 4500 is invested at a simple interest rate of 6% - what is the value of the investment after 10 months?






22. What is the maximum value for the function g(x) = (-2x^2) -1?






23. 1:sqrt3:2 is the ratio of the sides of what kind of triangle?






24. Max and Min lengths for a side of a triangle?






25. 3/8 in percent?






26. Is 0 even or odd?






27. 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?






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






29. From a box of 12 candles - you are to remove 5. How many different sets of 5 candles could you remove?






30. Evaluate (4^3)^2






31. If Madagascar'S exports totaled 1.3 billion in 2009 - and 4% came from China - what was the value in millions of the country'S exports to China?






32. Legs 6 - 8. Hypotenuse?






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






34. Define an 'expression'.






35. 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?






36. Formula for the area of a circle?






37. Formula of rectangle where l increases by 20% and w decreases by 20%






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






39. How many digits are there between the decimal point and the first even digit in the decimal equivalent of 1/[(2^8)(5^3)]






40. 413.03 x 10^(-4) =






41. To convert a percent to a fraction....






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 percent formula?






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






46. How many multiples does a given number have?






47. For what values should the domain be restricted for the function f(x) = sqrt(x + 8)






48. x^(-y)=






49. x^4 + x^7 =






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