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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. =2^8
Permutations ask for 'arraingements' Combinations ask for 'Groups'
256
6 -561
(b*h)/2

2. =7^3
112
343
70
48

3. =3^4
81
Add their exponents (6^2 *6^3 = 6^5)
70
104

4. If you raise a negative number to an odd power - what happens to the number?
Undefined
25
It gets smaller
18

5. even x odd =
171
45
Even
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)

6. =11*17
187
12
48
8

7. Any number to the 0 power is?
One (1)
59 -049
4
45

8. 0/1 =
320
9
400
0 (any fraction with 0 on top is 0)

9. =9*9
68
729
81
24

10. =10^1
7
10
120
88

11. =8^3
729
512
66
54

12. =6^6
46 -656
84
153
152

13. =2^5
182
32
96
238

14. Permutations: single source - order matters
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller
85
Add their exponents (6^2 *6^3 = 6^5)
169

15. 4/0 =
340
204
Undefined
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)

16. =8^1
68
8
Even
98

17. =4*13
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)
204
Won't = 1 - Will
52

18. =8*9
72
Multiply the numerators and put the product over the product of the denominators
64
36

19. What is the difference between a permutation or a combination?

20. =2^9
256
512
247
Multiply both fractions to get a common denominator add or subtract as usual

21. =3*18
100 -000
30
54
128

22. Does x^2 + x^3 = x^5?
It gets smaller
143
9
NO

23. =6*14
Multiply the # of choices for each of the spots
11
165
84

24. =11*13
3
Multiply the # of choices for each of the spots
4
143

25. When is a number divisible by 3?
3
343
Add their exponents (6^2 *6^3 = 6^5)
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)

26. =3*5
729
144
15
72

27. SQRT 100 -000 -000
136
256
10 -000
289

28. =5*5
60
4 -096
25
342

29. =11*14
10
Even
50
154

30. =6^3
8
216
112
156

31. =8*19
196
152
24
49

32. SQRT 49
7
Base * Height
6
140

33. 512^(1/3)
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
1 -000 -000 -000
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)
8

34. Area of a parallelogram?
Base * Height
64
125
20

35. =8*10
255
49
625
80

36. =4^2
16
104
24
8

37. =14*14
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)
196
Move the decimal to the right on both numbers until there is nothing to the right of the decimal
Amount of increase/original amount = x/100 (Then cross multiply to find x)

38. =12*16
300
40
10
192

39. Equation for a line?
285
90
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
343

40. =2^1
0 (any fraction with 0 on top is 0)
121
125
2

41. =3^1
180
64
10 -000 -000
3

42. How do you find the median of a set of numbers?
Undefined
255
Arrainge #s from least to greatest and take the middle number or the average of the two middle #s
68

43. =5*14
256
70
144
729

44. Problem that asks you to choose a # of items to fill specific spots - when each spot is filled from a different source?
49
Multiply the # of choices for each of the spots
117
16

45. =10^8
100 -000 -000
Invert (reciprocal) the second fraction and multiply
240
Pr^2

46. =2^4
729
16
133
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)

47. =5^3
68
1 -024
125
13

48. Exponents - Dividing numbers with same base
Subtract the smallest number from the greatest number
32
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)
210

49. =19*19
324
1.414213562
361
45

50. Adding or subtracting fractions with the same denominator
0 (any fraction with 0 on top is 0)
A+B (Add both probabilities)
Add or subtract the numbers on top and keep the same denominator
Odd