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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. If you raise a negative number to an even power - what happens to the number?
1.732050808
209
It becomes positive
Base * Height

2. =8*20
64
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
160
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)

3. =10^5
100 -000
18
340
(b*h)/2

4. =5*20
3 -125
11
100
1 -000

5. 4/0 =
220
Undefined
Multiply the numerators and put the product over the product of the denominators
90

6. =3*18
5^(1/3)
4
54
42

7. =9*12
108
512
144
32

8. 512^(1/3)
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
8
3 -125

9. =9^4
NO
54
380
6 -561

10. =8*19
152
Undefined
7
4 -096

11. =5*9
45
512
3
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller

12. =8*18
144
60
88
210

13. =3*3
36
9
2pr
256

14. How do you find the mode of a set of numbers?
Amount of increase/original amount = x/100 (Then cross multiply to find x)
Pick the # that occurs most frequently
45
288

15. =5*19
95
45
12
Odd

16. =6*20
72
120
1 -000 -000
(x-y)^2

17. =7^2
Multiply the # of choices for each of the spots
25
144
49

18. =7*14
70
98
6 -561
Move the decimal to the right on both numbers until there is nothing to the right of the decimal

19. Right Isosceles triangle (lengths)?
35
117
102
Side - Side - Side^2

20. How do you find the median of a set of numbers?
63
Arrainge #s from least to greatest and take the middle number or the average of the two middle #s
1 -000
119

21. =16*19
NO
84
304
72

22. =4^5
1 -024
2
32
6

23. =6*15
55
45
One (1)
90

24. Odds that something doesn't happen?

25. =3*16
48
90
Combinations don't care about the order of the problems
112

26. =9^5
59 -049
81
12
3

27. =9*16
144
Even
143
99

28. =7*20
27
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)
140
15

29. =6*19
81
Pick the # that occurs most frequently
114
80

30. Permutations: single source - order matters BUT only for a selection
Add or subtract the numbers on top and keep the same denominator
90
140
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller - stop when all the places are taken

31. =2^3
24
15
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
8

32. =13*14
180
182
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
64

33. =6^1
Number of outcomes you want/total number of possible outcomes
11
6
171

34. SQRT 169
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller
112
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
13

35. =3^1
28
6
3
Move the decimal to the right on both numbers until there is nothing to the right of the decimal

36. =6*11
Add their exponents (6^2 *6^3 = 6^5)
323
66
27

37. Does x^2 + x^3 = x^5?
NO
1 -024
100 -000
18

38. =12*18
216
49
64
33

39. =12*19
70
228
18
1 -024

40. =6*18
1 -024
4 -096
108
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)

41. =7*11
80
77
63
165

42. =7*12
84
1 -000 -000 -000
165
Even

43. =6*10
Add their exponents (6^2 *6^3 = 6^5)
60
30
Difference in the y-coordinates over the difference in the x coodinates

44. SQRT 4
256
20
2
46 -656

45. 729^(1/3)
9
117
64
10

46. SQRT 400
20
342
192
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6

47. 30:60:90 Right Triangle (Lenghts)
Invert (reciprocal) the second fraction and multiply
60
216
x:x^(1/3):2x

48. =5*5
30
25
Permutations ask for 'arraingements' Combinations ask for 'Groups'
169

49. =19*19
361
100 -000
625
Permutations ask for 'arraingements' Combinations ask for 'Groups'

50. =8*11
27
88
7
Base * Height