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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. Permutations: single source - order matters
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller
Won't = 1 - Will
27
117

2. =3*3
It gets smaller
80
9
6

3. even + odd =
Even
Odd
30
3

4. odd x odd =
36
Odd
The direction of the inequality symbol changes
300

5. =6*6
5
108
36
60

6. SQRT 49
400
7
Pr^2
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)

7. =15*18
24
270
288
7

8. =11*19
171
156
100
209

9. =14*16
5
224
729
132

10. =10^5
100 -000
120
32
39

11. =12*15
400
78
112
180

12. =5*18
90
52
Subtract the smallest number from the greatest number
153

13. =7*9
63
8
80
Amount of increase/original amount = x/100 (Then cross multiply to find x)

14. =4*9
36
72
6
16

15. =10^10
45
40
10 -000 -000 -000
50

16. =5*7
49
35
NO
81

17. =1^3
266
24
50
1

18. =3^4
84
81
10
It gets smaller

19. =6^6
102
228
46 -656
0 (any fraction with 0 on top is 0)

20. Pythagorean Triples (lengths)?
36
3:4:5 -- 5:12:13 -- 7:24:25
289
285

21. =5*11
2 -401
55
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
70

22. =2^10
2
100 -000
1 -024
25

23. When is a number divisible by 4?

24. =4*10
40
216
256
27

25. =17*18
81
11
306
28

26. =2^6
49
154
64
Invert (reciprocal) the second fraction and multiply

27. Odds that at least one thing will happen?

28. =13*13
2
42
Multiply the # of choices for each of the spots
169

29. Exponents - Dividing numbers with same base
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)
80
Rate * Time = Distance (Hint: Draw a chart)
187

30. =2^5
32
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
100 -000
187

31. Area of a circle?
135
42
112
Pr^2

32. =8*16
Multiply the # of choices for each of the spots
81
9
128

33. SQRT 2 -401
Multiply the numerators and put the product over the product of the denominators
49
221
120

34. Dividing Fractions
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
Invert (reciprocal) the second fraction and multiply
57
6

35. =3*4
Subtract the smallest number from the greatest number
12
NO
A*B (Multiply both probabilities)

36. =4^2
7
182
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)
16

37. =8*20
160
1 -024
2
9

38. =11*15
72
78
165
255

39. 30:60:90 Right Triangle (Lenghts)
85
24
x:x^(1/3):2x
8

40. =19*19
361
64
343
0 (any fraction with 0 on top is 0)

41. =16*19
304
168
39
216

42. Adding or subtracting fractions with the same denominator
Add or subtract the numbers on top and keep the same denominator
234
25
57

43. =6*18
6
Side - Side - Side^2
5
108

44. 216^(1/3)
6
70
59 -049
Arrainge #s from least to greatest and take the middle number or the average of the two middle #s

45. =3*13
324
30
144
39

46. =9*14
126
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
45
40

47. =4^5
The direction of the inequality symbol changes
1 -024
625
33

48. =2^4
105
(b*h)/2
152
16

49. =2^7
128
95
Move the decimal to the right on both numbers until there is nothing to the right of the decimal
63

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