## Test your basic knowledge |

# GRE Math: Common Errors

**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 is the formula for compounded interest?**

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

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

**4. Can the input value of a function have more than one output value (i.e. x: y - y1)?**

**5. 1/2 divided by 3/7 is the same as**

**6. How many sides does a hexagon have?**

**7. Legs 6 - 8. Hypotenuse?**

**8. How to determine percent increase?**

**9. Which is greater? 200x^295 or 10x^294?**

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

**11. Define a 'Term' -**

**12. What is a chord of a circle?**

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

**14. Number of degrees in a triangle**

**15. 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?**

**16. What is the slope of a vertical line?**

**17. How to determine percent decrease?**

**18. What are the irrational numbers?**

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

**20. Factor a^2 + 2ab + b^2**

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

**22. 1:1:sqrt2 is the ratio of the sides of what kind of triangle?**

**23. Factor x^2 - xy + x.**

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

**25. 40 < all primes<50**

**26. 5/8 in percent?**

**27. What is a minor arc?**

**28. What does the graph x^2 + y^2 = 64 look like?**

**29. 1/8 in percent?**

**30. (6sqrt3) x (2sqrt5) =**

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

**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. 10<all primes<20**

**34. 1/6 in percent?**

**35. Formula for the area of a circle?**

**36. If a=-1 and b=3 - what is the value of (4(a^3)(b^2) - 12(a^2)(b^5)) / (16(a^3)(b^2))?**

**37. 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)**

**38. 5x^2 - 35x -55 = 0**

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

**40. What is the measure of an exterior angle of a regular pentagon?**

**41. What is a central angle?**

**42. What does scientific notation mean?**

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

**44. 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?**

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

**46. What is the area of a regular hexagon with side 6?**

**47. When the 'a' in the parabola is negative...**

**48. Write 10 -843 X 10^7 in scientific notation**

**49. 10^6 has how many zeroes?**

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