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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. x^4 + x^7 =






2. Evaluate and write as a mixed number: 2/7 - 3/21 + 2 & 4/14






3. What percent of 40 is 22?






4. 1:sqrt3:2 is the ratio of the sides of what kind of triangle?






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






6. (12sqrt15) / (2sqrt5) =






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






8. How to find the area of a sector?






9. 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?






10. What is the third quartile of the following data set: 44 - 58 - 63 - 63 - 68 - 70 - 82






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






12. What is the formula for computing simple interest?






13. 2sqrt4 + sqrt4 =






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






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






16. Formula to calculate arc length?






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






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






19. a^2 - b^2 =






20. To convert a percent to a fraction....






21. 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)?






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






23. Formula to find a circle'S circumference from its radius?






24. Volume for a cylinder?






25. What are the integers?






26. What is the absolute value function?






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






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






29. Legs: 3 - 4. Hypotenuse?






30. When the 'a' in a parabola is positive....






31. 50 < all primes< 60






32. 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?






33. 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?






34. What is an exterior angle?






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






36. What is it called when a point is reflected to the quadrant opposite it (i.e. I to III or II to IV)?






37. The ratio of the areas of two similar polygons is ...






38. Employee X is paid 19.50 per hour no matter how many a week. Employee Y earns 18 for the first 40 and 1.5 the hourly wage for every hour after that. If both earned the same amount and worked the same in one week - how many did each work?






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






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






41. Formula for the area of a circle?






42. 7/8 in percent?






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






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






45. Suppose that the graph of f(x) is the result of sliding the graph of y=2x^2 down 3 units of spaces. What is the new equation?






46. What is a subset?






47. 70 < all primes< 80






48. When the 'a' in the parabola is negative...






49. (x^2)^4






50. What are the real numbers?