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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. =10^2
361
0 (any fraction with 0 on top is 0)
100
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)

2. Distance Formula?
45
88
15
Rate * Time = Distance (Hint: Draw a chart)

3. SQRT 4 -096
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)
27
33
64

4. Problem that asks you to choose a # of items to fill specific spots - when each spot is filled from a different source?
143
Multiply the # of choices for each of the spots
360
70

5. even x even =
1 -296
Even
80
45

6. =3*6
18
126
Permutations ask for 'arraingements' Combinations ask for 'Groups'
50

7. =6^3
209
171
216
54

8. Permutations: single source - order matters BUT only for a selection
120
400
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller - stop when all the places are taken

9. =5^2
25
80
252
160

10. =8*10
80
343
64
51

11. =10^10
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)
10 -000 -000 -000
49
180

12. =10^8
100 -000 -000
Even
10
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)

13. =8*19
152
Invert (reciprocal) the second fraction and multiply
4
105

14. 343^(1/3)
7
343
9
0 (any fraction with 0 on top is 0)

15. 4/0 =
Undefined
285
51
Odd

16. =7^3
343
27
100
108

17. =18*19
16
48
Will = 1 - Won't
342

18. =7*20
Even
7
(b*h)/2
140

19. =12*17
204
Combinations don't care about the order of the problems
112
NO

20. Basic probability formula?
80
Number of outcomes you want/total number of possible outcomes
8
6

21. =8*15
27
20
120
40

22. =6*10
60
84
70
Number of outcomes you want/total number of possible outcomes

23. =3*3
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
9
81
60

24. =12*16
2 -401
59 -049
75
192

25. =4^4
NO
153
256
Ignor decimal points and multiply the two numbers - then count the digits to the right of the decimal points in the original numbers and place the decimal so there are the same number of digits to the right of the decimal

26. =12*18
216
196
50
400

27. =7^1
55
7
27
99

28. =7*15
76
60
105
143

29. =6^1
154
6
70
2

30. =5*18
182
90
380
88

31. What is the difference between a permutation or a combination?

32. =9^2
8
187
x:x^(1/3):2x
81

33. =12*20
3
240
48
1 -024

34. Pythagorean Triples (lengths)?
342
3:4:5 -- 5:12:13 -- 7:24:25
1 -024
78

35. =5^4
Invert (reciprocal) the second fraction and multiply
72
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
625

36. SQRT 3
1.732050808
Add their exponents (6^2 *6^3 = 6^5)
114
Add or subtract the numbers on top and keep the same denominator

37. =7*10
A*B (Multiply both probabilities)
70
10 -000 -000 -000
60

38. =6*15
35
6 -561
One (1)
90

39. =3^4
81
216
Amount of increase/original amount = x/100 (Then cross multiply to find x)
16

40. 729^(1/3)
238
9
1.732050808
182

41. Odds that at least one thing will happen?

42. =10^3
3:4:5 -- 5:12:13 -- 7:24:25
1 -000
272
27

43. =20^2
400
176
Add their exponents (6^2 *6^3 = 6^5)
100

44. SQRT 100 -000 -000
2 -401
625
195
10 -000

45. When is a number divisible by 4?

46. Right Isosceles triangle (lengths)?
64
216
243
Side - Side - Side^2

47. =2^2
114
4
48
221

48. =5^1
5
120
320
60

49. =3*9
60
27
88
6

50. =5*11
625
Add their exponents (6^2 *6^3 = 6^5)
Even
55