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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. What are the integers?






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






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






4. 3/8 in percent?






5. 20<all primes<30






6. What is the 'union' of A and B?






7. 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?






8. Evaluate (4^3)^2






9. 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?






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






11. Area of a triangle?






12. What is the slope of a horizontal line?






13. x^4 + x^7 =






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






15. P and r are factors of 100. What is greater - pr or 100?






16. a^2 - b^2






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






18. 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?






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






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






21. 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?






22. Define a 'monomial'






23. Pi is a ratio of what to what?

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24. Legs: 3 - 4. Hypotenuse?






25. Which quadrant is the upper right hand?






26. 7/8 in percent?






27. What are congruent triangles?






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. 2sqrt4 + sqrt4 =






30. What is a set with no members called?






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






32. What is a minor arc?

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33. To convert a percent to a fraction....






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






35. sqrt 2(sqrt 6)=






36. 1/6 in percent?






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






38. 1:1:sqrt2 is the ratio of the sides of what kind of triangle?






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






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






41. 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?






42. 4.809 X 10^7 =






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






44. Legs 6 - 8. Hypotenuse?






45. 413.03 x 10^(-4) =






46. 30< all primes<40






47. What does the graph (x+2)^2 + (y+2)^2 = 9 look like?






48. Simplify 9^(1/2) X 4^3 X 2^(-6)?






49. Which quadrant is the upper left hand?






50. What is the empty set?







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