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






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






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






4. 20<all primes<30






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






6. 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)?






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






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






9. What are the irrational numbers?

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10. 1:1:sqrt2 is the ratio of the sides of what kind of triangle?






11. 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?






12. How to find the area of a sector?






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






14. What is a subset?






15. a^2 - b^2






16. 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?






17. What is a finite set?






18. 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?






19. x^4 + x^7 =






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






21. The four angles around a point measure y - 2y - 35 and 55 respectively. What is the value of y?






22. What is the percent formula?






23. Simplify the expression (p^2 - q^2)/ -5(q - p)






24. Which is greater? 27^(-4) or 9^(-8)






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






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






27. What are congruent triangles?






28. What is an exterior angle?






29. 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)]?






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






31. x^(-y)=






32. 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?






33. a^0 =






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






35. x^2 = 9. What is the value of x?






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






37. What transformation occurs if point C is reflected over the x-axis and then the y-axis?






38. Surface area for a cylinder?






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






40. Which quandrant is the lower right hand?






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






42. 30< all primes<40






43. What are 'Supplementary angles?'






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






45. What percent of 40 is 22?






46. Formula for the area of a circle?






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






48. 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?






49. 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?






50. What is the 'Range' of a series of numbers?