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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. SQRT 36
64
6
66
144

2. Odds that something doesn't happen?

3. =5^2
Combinations don't care about the order of the problems
220
25
117

4. =7*15
105
625
266
81

5. How do you find the slope of a line?
Difference in the y-coordinates over the difference in the x coodinates
44
100 -000 -000
400

6. 0/1 =
Even
0 (any fraction with 0 on top is 0)
Invert (reciprocal) the second fraction and multiply
1.732050808

7. =6*13
78
729
187
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)

8. Key to percent increase/decrease
52
36
Amount of increase/original amount = x/100 (Then cross multiply to find x)
25

9. =10^3
1 -000
9
512
234

10. Another way to write cube root 5
288
5^(1/3)
Add their exponents (6^2 *6^3 = 6^5)
46 -656

11. =2^7
15
306
128
Odd

12. =9*18
25
27
162
252

13. =7^2
5^(1/3)
49
255
Multiply the numerators and put the product over the product of the denominators

14. =15*17
105
255
156
143

15. =4*8
10 -000 -000 -000
48
324
32

16. How do you tell if it's a permutation or combination?

17. =14*16
729
100 -000 -000
210
224

18. =8^3
NO
243
Multiply both fractions to get a common denominator add or subtract as usual
512

19. =16*16
256
30
187
Number of outcomes you want/total number of possible outcomes

20. =9*17
108
11
0 (any fraction with 0 on top is 0)
153

21. Adding or subtracting fractions with the same denominator
Add or subtract the numbers on top and keep the same denominator
90
121
100 -000

22. =2^2
4
68
98
252

23. Permutations: single source - order matters
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
Multiply the # of choices for each of the spots
91
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller

24. =5*16
20
80
36
324

25. =12*18
9
216
4 -096
1 -024

26. =2^1
27
10 -000 -000 -000
2
60

27. =18*19
Even
342
13
80

28. =4*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)
18
40
100 -000

29. =7^1
32
7
4
3

30. =5^4
60
It gets smaller
625
380

31. =5^1
5
Even
88
16

32. SQRT 6 -561
220
1 -296
81
Arrainge #s from least to greatest and take the middle number or the average of the two middle #s

33. 8^(1/3)
2
104
42
1 -024

34. =9*16
3:4:5 -- 5:12:13 -- 7:24:25
144
2pr
9

35. 4/0 =
NO
95
Undefined
51

36. =2^3
289
A*B (Multiply both probabilities)
8
Odd

37. =19*20
380
35
It gets smaller
133

38. =9*10
323
12
6 -561
90

39. odd + odd =
8
Even
243
343

40. Does (x^2 + y^2 + z^2)/(x^2 + y^2) = z^2?
80
144
65
NO

41. =12*12
Move the decimal to the right on both numbers until there is nothing to the right of the decimal
196
144
100 -000

42. =11*17
81
75
187
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

43. =6*14
99
114
84
36

44. =15*20
300
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
121

45. =7*14
361
98
33
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

46. =19*19
361
Add or subtract the numbers on top and keep the same denominator
64
5

47. =8*14
27
64
112
6

48. =14*19
x:x^(1/3):2x
266
One (1)
80

49. =6*20
1.732050808
120
625
3 -125

50. Pythagorean Triples (lengths)?
3:4:5 -- 5:12:13 -- 7:24:25
144
Pick the # that occurs most frequently
119