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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 roots of the quadrinomial x^2 + 2x + 1?






2. Legs 5 - 12. Hypotenuse?






3. 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?






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






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






6. Number of degrees in a triangle






7. 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?






8. What is a subset?






9. What is the empty set?






10. 10<all primes<20






11. What is a tangent?






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






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






14. 30< all primes<40






15. Nine coins are tossed simultaneously. In how many of the outcomes will the fourth coin tossed show heads?






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






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






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






19. 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?






20. Define an 'expression'.






21. (-1)^3 =






22. 10^6 has how many zeroes?






23. What is the formula for compounded interest?






24. What are the irrational numbers?

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






26. What is a finite set?






27. Describe the relationship between 3x^2 and 3(x - 1)^2






28. x^4 + x^7 =






29. 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)






30. How to determine percent increase?






31. How to determine percent decrease?






32. What is a piecewise equation?






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






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






35. Simplify 4sqrt21 X 5sqrt2 / 10sqrt7






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






37. 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?






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






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






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






41. 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?






42. 1:1:sqrt2 is the ratio of the sides of what kind of triangle?






43. Evaluate 4/11 + 11/12






44. To multiply a number by 10^x






45. Factor a^2 + 2ab + b^2






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






47. 20<all primes<30






48. 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?






49. 0^0






50. Circumference of a circle?