## 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. 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)**

**2. Which quadrant is the lower left hand?**

**3. What are congruent triangles?**

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

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

**6. The objects in a set are called two names:**

**7. Formula for the area of a sector of a circle?**

**8. (a^-1)/a^5**

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

**10. What is a parabola?**

**11. A number is divisible by 4 is...**

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

**13. 4.809 X 10^7 =**

**14. The larger the absolute value of the slope...**

**15. 70 < all primes< 80**

**16. 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?**

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

**18. What are complementary angles?**

**19. What percent of 40 is 22?**

**20. 1:1:sqrt2 is the ratio of the sides of what kind of triangle?**

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

**22. (x^2)^4**

**23. What is the 'Restricted domain of a function'?**

**24. 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?**

**25. Can you simplify sqrt72?**

**26. 1/2 divided by 3/7 is the same as**

**27. 40 < all primes<50**

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

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

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

**31. Evaluate and write as a mixed number: 2/7 - 3/21 + 2 & 4/14**

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

**33. Legs 5 - 12. Hypotenuse?**

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

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

**36. x^(-y)=**

**37. What is the 'union' of A and B?**

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

**39. In similar hexagons - the ratio of the areas is 16:25. What is the ratio of their corresponding sides?**

**40. To multiply a number by 10^x**

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

**42. 60 < all primes <70**

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

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

**45. Can you add sqrt 3 and sqrt 5?**

**46. What is the 'domain' of a function?**

**47. Can you subtract 3sqrt4 from sqrt4?**

**48. What is the formula for computing simple interest?**

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

**50. Define an 'expression'.**