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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*12
42
60
95
45

2. =6^4
63
165
NO
1 -296

3. 30:60:90 Right Triangle (Lenghts)
x:x^(1/3):2x
32
225
36

4. Area of a parallelogram?
81
Base * Height
5^(1/3)
96

5. =3*11
33
8
304
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)

6. Permutations: single source - order matters BUT only for a selection
119
Pr^2
121
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller - stop when all the places are taken

7. SQRT 64
125
2
59 -049
8

8. =3*14
42
Base * Height
Invert (reciprocal) the second fraction and multiply
Permutations ask for 'arraingements' Combinations ask for 'Groups'

9. Dividing Decimals
Move the decimal to the right on both numbers until there is nothing to the right of the decimal
5
729
400

10. =11*20
120
220
(x-y)^2
180

11. =6*16
1 -000
96
5
10 -000

12. odd + odd =
208
Even
102
12

13. =4*5
1.732050808
196
20
44

14. Permutations: single source - order matters
304
152
361
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller

15. =5*17
304
85
Invert (reciprocal) the second fraction and multiply
57

16. =9*19
6
323
4
171

17. =3^6
36
98
729
It becomes positive

18. =14*20
108
280
Line up the decimal points and proceed as usual
4

19. Problem that asks you to choose a # of items to fill specific spots - when each spot is filled from a different source?
729
180
(x-y)^2
Multiply the # of choices for each of the spots

20. =14*15
60
9
12
210

21. Exponents - Dividing numbers with same base
64
121
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)
54

22. how do you find the range of a set of numbers?
10 -000 -000 -000
72
195
Subtract the smallest number from the greatest number

23. =8*19
6 -561
152
2pr
NO

24. If you raise a negative number to an even power - what happens to the number?
It becomes positive
6 -561
45
36

25. =7*8
324
120
252
56

26. =8^2
64
10 -000
120
132

27. =7*13
68
64
91
27

28. Odds that at least one thing will happen?

29. =2^6
221
It becomes positive
64
209

30. =12*16
90
192
It becomes positive
306

31. =5*10
72
224
135
50

32. =9^2
7
81
1.414213562
99

33. =8*16
60
128
4
77

34. =11*17
625
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
65

35. =5^3
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
135
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller - stop when all the places are taken
125

36. =3*12
16
36
4
Pr^2

37. even + odd =
Odd
289
70
16

38. =4*4
2pr
10
8
16

39. SQRT 256
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)
84
16
270

40. =7^4
80
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
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)
2 -401

41. =8*11
88
96
70
30

42. Pythagorean Triples (lengths)?
68
512
3:4:5 -- 5:12:13 -- 7:24:25
81

43. Key to percent increase/decrease
30
Amount of increase/original amount = x/100 (Then cross multiply to find x)
285
108

44. =3*6
16
18
320
13

45. Area of a circle?
625
16
Pr^2
32

46. =4*16
91
4
Add or subtract the numbers on top and keep the same denominator
64

47. =7*17
48
3 -125
104
119

48. =20*20
100
1
400
24

49. =6*13
78
343
304
36

50. SQRT 400
20
154
96
64