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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. Whats the difference between factors and multiples?






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






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






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






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






6. 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?






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






8. 200 <_ x <_ 300. How many values of x are divisible by 5 & 8?






9. 5/6 in percent?






10. How to determine percent decrease?






11. How to determine percent increase?






12. What is the 'domain' of a function?






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






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






15. A company places a 6-symbol code on each product. The code consists of the letter T - followed by 3 numerical digits - and then 2 consonants (Y is a conson). How many codes are possible?






16. Can you subtract 3sqrt4 from sqrt4?






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






18. Area of a triangle?






19. x^4 + x^7 =






20. What is the surface area of a cylinder with radius 5 and height 8?






21. 10<all primes<20






22. 10^6 has how many zeroes?






23. Pi is a ratio of what to what?

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24. What is the 'Solution' for a system of linear equations?






25. What is the common monomial factor in the expression 4(c^3)d - (c^2)(d^2) + 2cd?






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






27. 413.03 x 10^(-4) =






28. 5x^2 - 35x -55 = 0






29. What is the 'Restricted domain of a function'?






30. 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?






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






32. What is the coefficient of the x^2 term in the product of (x + 1)(x + 2)(x -1)?






33. What is the ratio of the sides of an isosceles right triangle?






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






35. 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?






36. 1/6 in percent?






37. What is a set with no members called?






38. 1/2 divided by 3/7 is the same as






39. 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?






40. What is an isoceles triangle?






41. a^0 =






42. 1/8 in percent?






43. What is a tangent?






44. (a^-1)/a^5






45. Legs 6 - 8. Hypotenuse?






46. What are 'Supplementary angles?'






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






48. x^6 / x^3






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






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