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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. =6^1
1 -000 -000
6
Amount of increase/original amount = x/100 (Then cross multiply to find x)
104

2. Permutations: single source - order matters
Undefined
512
216
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller

3. =6*8
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)
48
42
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

4. =12*13
(b*h)/2
156
36
64

5. even x even =
144
Even
48
Multiply the # of choices for each of the spots

6. =15*19
285
90
80
7

7. =8*13
20
221
46 -656
104

8. =9*16
Move the decimal to the right on both numbers until there is nothing to the right of the decimal
144
56
143

9. =3*20
70
10 -000 -000 -000
60
15

10. When is a number divisible by 6?
20
64
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 -401

11. =6^4
10
27
1 -296
10 -000 -000

12. =8^3
117
8
NO
512

13. =13*14
80
182
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
99

14. =3*8
11
24
NO
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)

15. 8^(1/3)
NO
270
2
4 -096

16. =7*11
11
It becomes positive
Move the decimal to the right on both numbers until there is nothing to the right of the decimal
77

17. 30:60:90 Right Triangle (Lenghts)
180
Subtract the smallest number from the greatest number
x:x^(1/3):2x
255

18. Key to percent increase/decrease
Amount of increase/original amount = x/100 (Then cross multiply to find x)
51
72
24

19. =8*8
340
243
108
64

20. How do you find the mode of a set of numbers?
32
Pick the # that occurs most frequently
(x-y)^2
36

21. Does (x^2 + y^2 + z^2)/(x^2 + y^2) = z^2?
144
54
Base * Height
NO

22. SQRT 100 -000 -000
10 -000
6 -561
180
25

23. Odds that at least one thing will happen?

24. =11*12
112
49
132
Even

25. Another way to write cube root 5
400
260
3 -125
5^(1/3)

26. =13*16
266
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)
20
208

27. =7*19
729
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)
133
59 -049

28. =7^3
x:x^(1/3):2x
343
45
48

29. Exponents - Raising a power to a power
81
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6
272
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)

30. =7*8
Combinations don't care about the order of the problems
56
52
255

31. Dividing Decimals
44
192
195
Move the decimal to the right on both numbers until there is nothing to the right of the decimal

32. =4*14
625
81
32
56

33. =9^4
6 -561
4
343
80

34. =2^5
64
512
238
32

35. =6*7
42
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)
729
128

36. even x odd =
It gets smaller
6 -561
Even
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)

37. =10^5
9
100 -000
112
289

38. Area of a parallelogram?
0 (any fraction with 0 on top is 0)
Base * Height
180
The direction of the inequality symbol changes

39. Adding or subtracting fractions with the same denominator
56
Add or subtract the numbers on top and keep the same denominator
2pr
36

40. SQRT 729
6
252
Difference in the y-coordinates over the difference in the x coodinates
27

41. =15*15
225
72
256
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6

42. =2^9
27
512
2
343

43. =4*11
7 -776
44
33
102

44. =9*13
1 -000
56
2
117

45. Probability that A or B will happen?
3 -125
3
60
A+B (Add both probabilities)

46. =6^3
216
343
60
102

47. =3*11
84
It gets smaller
33
266

48. SQRT 64
88
8
171
3

49. =6*14
27
84
Even
4 -096

50. =7*9
4
NO
46 -656
63