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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. =3^3
4
196
27
50

2. If you raise a negative number to an odd power - what happens to the number?
3
128
152
It gets smaller

3. =14*20
252
126
132
280

4. Factor x^2-2xy+y^2
(x-y)^2
50
95
25

5. Circumference of a circle?
168
512
2pr
11

6. =9*20
343
3
36
180

7. Dividing Fractions
66
96
Invert (reciprocal) the second fraction and multiply
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)

8. =4^1
4
85
Even
Base * Height

9. SQRT 121
306
81
11
x:x^(1/3):2x

10. =3^3
8
270
280
27

11. =9*10
64
1.732050808
272
90

12. Permutations: single source - order matters
44
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller
125
8

13. =6*10
60
120
NO
3

14. If you raise a negative number to an even power - what happens to the number?
260
10
It becomes positive
Number of outcomes you want/total number of possible outcomes

15. =7*9
24
169
63
136

16. =9^3
120
45
729
20

17. Key to percent increase/decrease
112
75
Amount of increase/original amount = x/100 (Then cross multiply to find x)
8

18. 512^(1/3)
27
49
8
32

19. =8*12
46 -656
4
96
132

20. =4*17
1 -000
256
68
25

21. =11*19
209
2 -401
20
729

22. =1^3
136
1
2
343

23. Pythagorean Triples (lengths)?
3:4:5 -- 5:12:13 -- 7:24:25
132
128
216

24. =10^6
343
36
625
1 -000 -000

25. =10^10
306
10 -000 -000 -000
342
64

26. =7^2
81
75
49
Even

27. =3^2
49
3
A+B (Add both probabilities)
9

28. =11*14
Even
91
154
196

29. Probability that A and B will both happen?
100
165
A*B (Multiply both probabilities)
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)

30. SQRT 4
It gets smaller
60
2
100

31. Combinations: single source - order doesn't matter
343
64
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)
Odd

32. =8*20
160
36
Combinations don't care about the order of the problems
2

33. =9*18
Undefined
20
4
162

34. =12*19
Combinations don't care about the order of the problems
228
Even
11

35. =3^1
126
63
3
132

36. =13*14
182
3
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)
216

37. =2^8
80
8
256
196

38. =13*13
169
NO
100 -000 -000
76

39. =3*9
108
70
27
625

40. =5*12
60
221
Permutations ask for 'arraingements' Combinations ask for 'Groups'
340

41. =14*14
182
196
36
4 -096

42. =15*18
270
15
729
729

43. =16*20
70
15
320
It becomes positive

44. =6*12
72
20
234
256

45. =11*11
Number of outcomes you want/total number of possible outcomes
1 -000 -000 -000
121
It gets smaller

46. =3*18
54
104
169
24

47. =5^5
40
3 -125
27
221

48. 343^(1/3)
512
270
9
7

49. Exponents - Multiplying numbers with same base
117
221
Add their exponents (6^2 *6^3 = 6^5)
125

50. =7*13
16
91
117
171