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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. =5^4
16
323
99
625

2. =7*15
105
32
4
88

3. If you raise a positive fraction that is less than 1 to a power - what happens to the fraction?
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)
It gets smaller
7 -776
144

4. =9*18
70
Invert (reciprocal) the second fraction and multiply
162
51

5. 216^(1/3)
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)
6
72
35

6. =14*20
6
105
280
90

7. =7*10
70
100 -000
320
180

8. =11*11
121
7
140
Even

9. =16*19
57
2pr
304
4

10. =2^1
64
12
2
2pr

11. =13*20
102
4
260
Arrainge #s from least to greatest and take the middle number or the average of the two middle #s

12. =5*20
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
100
625
24

13. Does (x^2 + y^2 + z^2)/(x^2 + y^2) = z^2?
NO
216
220
288

14. =8^3
512
64
72
81

15. =8*18
144
Undefined
108
4

16. =12*20
247
240
25
64

17. =4^1
400
Even
4
256

18. Factor x^2-2xy+y^2
91
(x-y)^2
4
64

19. =8*15
120
54
0 (any fraction with 0 on top is 0)
64

20. =10^5
100 -000
135
60
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)

21. Probability that A and B will both happen?
324
A*B (Multiply both probabilities)
64
144

22. =7^3
100
10 -000 -000 -000
4 -096
343

23. =17*17
9
2pr
152
289

24. =17*19
323
160
Base * Height
256

25. Exponents - Raising a power to a power
304
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6
112
It gets smaller

26. =6*18
33
234
255
108

27. multiplying decimals
4
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
228
35

28. =4*8
32
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
10 -000
36

29. =18*20
360
x:x^(1/3):2x
NO
20

30. =11*20
320
84
114
220

31. =8*12
6
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)
216
96

32. How do you find the mode of a set of numbers?
400
Undefined
Pick the # that occurs most frequently
128

33. =7*14
Permutations ask for 'arraingements' Combinations ask for 'Groups'
306
98
One (1)

34. =3*5
324
Pr^2
27
15

35. =2^2
90
4
225
39

36. =25^2
143
625
Arrainge #s from least to greatest and take the middle number or the average of the two middle #s
320

37. Permutations: single source - order matters BUT only for a selection
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller - stop when all the places are taken
160
238
272

38. =8*17
136
Amount of increase/original amount = x/100 (Then cross multiply to find x)
4
144

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

40. =6*13
78
42
100
Pick the # that occurs most frequently

41. =3*9
24
27
152
10 -000 -000

42. =8*14
117
1 -000
112
40

43. Area of a parallelogram?
Base * Height
NO
32
4

44. =5*10
50
126
100
256

45. =2^9
18
Multiply the numerators and put the product over the product of the denominators
260
512

46. =12*16
75
84
54
192

47. even x even =
Even
247
Undefined
228

48. =4*9
225
36
Base * Height
144

49. =9*16
9
100 -000
144
135

50. =12*19
4
300
228
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