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GMAT Math Memorization

Subjects : gmat, 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. =13*18
80
Undefined
234
Itself

2. =7*20
76
105
140
100

3. =13*20
64
49
260
7

4. SQRT 6 -561
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
729
168
81

5. =11*12
90
132
36
221

6. =1^3
247
1
225
59 -049

7. =2^5
32
16
63
6 -561

8. =16*19
119
2pr
NO
304

9. 125^(1/3)
5
117
18
320

10. =17*20
4
64
340
65

11. =4*13
243
52
If it is divisible by both 2 and 3 (318 is because it is even and the sum of 3+1+8 is divisible by 3)
Subtract the smallest number from the greatest number

12. =9*19
81
55
64
171

13. =5^3
45
125
It gets smaller
30

14. Problem that asks you to choose a # of items to fill specific spots - when each spot is filled from a different source?
81
4
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
Multiply the # of choices for each of the spots

15. Does (x^2 + y^2 + z^2)/(x^2 + y^2) = z^2?
NO
Even
238
8

16. SQRT 1 -000 -000
512
Rate * Time = Distance (Hint: Draw a chart)
5
1 -000

17. =16*20
240
27
320
729

18. =11*15
50
33
68
165

19. If you raise a negative number to an even power - what happens to the number?
It becomes positive
224
16
114

20. =9^5
729
192
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)
59 -049

21. =9*20
512
4 -096
180
24

22. Pythagorean Triples (lengths)?
3
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller - stop when all the places are taken
3:4:5 -- 5:12:13 -- 7:24:25
306

23. SQRT 2
1.414213562
15
78
1 -000 -000 -000

24. =5*8
361
15
40
133

25. =15*20
300
24
187
144

26. =18*20
360
16
44
Multiply the # of choices for each of the spots

27. =8*13
104
39
8
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)

28. =10^10
216
10 -000 -000 -000
48
30

29. Basic probability formula?
144
Number of outcomes you want/total number of possible outcomes
A+B (Add both probabilities)
225

30. =9^3
Base * Height
A*B (Multiply both probabilities)
729
1.414213562

31. SQRT 25
3
5
Number of outcomes you want/total number of possible outcomes
48

32. =3*12
52
Difference in the y-coordinates over the difference in the x coodinates
288
36

33. odd + odd =
81
Multiply the # of choices for each of the spots
Even
(x-y)^2

34. =7^2
343
40
49
85

35. Does x^2 + x^3 = x^5?
8
289
NO
380

36. =5*12
5^(1/3)
60
25
36

37. =3*13
304
210
39
285

38. Exponents - Dividing numbers with same base
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)
49
Number of outcomes you want/total number of possible outcomes
20

39. =4*10
25
36
40
y=mx+b where b is the y-intercept (the point which crosses the y-axis) m is the slope of the line - and x & y are the coordinates of some point on that line

40. =4^6
4 -096
216
56
72

41. SQRT 81
154
33
9
1 -000

42. 216^(1/3)
40
112
64
6

43. Key to percent increase/decrease
300
49
The direction of the inequality symbol changes
Amount of increase/original amount = x/100 (Then cross multiply to find x)

44. =4*11
361
44
(x-y)^2
48

45. How do you find the mode of a set of numbers?
NO
Pick the # that occurs most frequently
160
4

46. =4*16
270
64
140
10 -000

47. SQRT 225
15
7 -776
210
144

48. =3*16
One (1)
48
3:4:5 -- 5:12:13 -- 7:24:25
266

49. =10^5
247
1.732050808
3 -125
100 -000

50. Circumference of a circle?
2pr
Invert (reciprocal) the second fraction and multiply
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)
10 -000 -000 -000