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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. Reduce: 4.8 : 0.8 : 1.6






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






3. If r - t - s & u are distinct - consecutive prime numbers - less than 31 - which of the following could be an average of them (4 - 4.25 - 6 - 9 - 24 - 22 - 24)






4. Surface area for a cylinder?






5. 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?






6. What is the ratio of the sides of a 30-60-90 triangle?






7. 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?






8. (6sqrt3) x (2sqrt5) =






9. What does scientific notation mean?






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






11. A triangle is inscribed in a semi circle with legs 5 and 12. What is the circumfermence of the semicircle?






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






13. If an inequality is multiplied or divided by a negative number....






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






15. 20<all primes<30






16. What percent of 40 is 22?






17. What are the real numbers?






18. Is 0 even or odd?






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






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






21. What is an isoceles triangle?






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






23. In a regular polygon with n sides - the formula for the sum of interior angles






24. What is the percent formula?






25. Factor x^2 - xy + x.






26. 60 < all primes <70






27. Solve the quadratic equation ax^2 + bx + c= 0






28. 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?






29. What is a set with no members called?






30. T or F? Given d -e &f =/ 0 - [(d^3)e(f^5)] / 2d(e^3) / [3(d^2)(e^3)(f^7)] / [6(e^5)(f^2)]?






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






32. Evaluate (4^3)^2






33. 6w^2 - w - 15 = 0






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






35. 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?






36. What is the 'Range' of a function?






37. What is the formula for compounded interest?






38. Legs 6 - 8. Hypotenuse?






39. Evaluate 4/11 + 11/12






40. 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?






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






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






43. How many sides does a hexagon have?






44. How to find the diagonal of a rectangular solid?






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






46. 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?






47. Legs 5 - 12. Hypotenuse?






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






49. (x^2)^4






50. 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)?