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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. Exponents - Multiplying numbers with same base
45
100 -000 -000
8
Add their exponents (6^2 *6^3 = 6^5)

2. Exponents - Raising a power to a power
304
80
0 (any fraction with 0 on top is 0)
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6

3. =4^5
1 -024
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
25
8

4. =5*15
512
75
16
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)

5. multiplying decimals
81
49
20
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

6. =2^2
4
128
16
114

7. even + even =
255
Even
729
25

8. =13*15
76
136
195
Add or subtract the numbers on top and keep the same denominator

9. odd x odd =
512
64
Odd
16

10. =11*11
272
Odd
36
121

11. =8^3
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6
1.732050808
48
512

12. Equation for a line?
343
7
Permutations ask for 'arraingements' Combinations ask for 'Groups'
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

13. SQRT 225
272
176
Will = 1 - Won't
15

14. 8^(1/3)
121
2
11
512

15. Area of a triangle?
75
(b*h)/2
126
70

16. =2^3
1.414213562
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
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
8

17. =16*20
9
320
95
30

18. =2^6
4
64
3 -125
8

19. =4*8
45
44
It gets smaller
32

20. If you raise a negative number to an even power - what happens to the number?
7 -776
136
48
It becomes positive

21. =12*18
216
168
144
68

22. Circumference of a circle?
80
225
Undefined
2pr

23. =4^6
4 -096
56
135
256

24. 4/0 =
50
78
Undefined
300

25. =3*13
NO
39
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller - stop when all the places are taken
1 -296

26. =13*18
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
11
128
234

27. =4*5
84
10
6
20

28. =7*11
132
77
65
361

29. =11*19
One (1)
90
209
84

30. =6*9
45
512
54
30

31. =5*16
13
9
80
64

32. =3*18
6 -561
Combinations don't care about the order of the problems
54
25

33. =8*20
120
Arrainge #s from least to greatest and take the middle number or the average of the two middle #s
160
60

34. =4^3
42
380
64
192

35. =7*20
72
40
140
63

36. =6*11
66
256
234
112

37. =15*16
9
10 -000
240
It gets smaller

38. =3*15
45
216
100 -000 -000
Combinations don't care about the order of the problems

39. =6*20
Number of outcomes you want/total number of possible outcomes
120
96
60

40. =4*18
64
3
90
72

41. =3*16
220
40
70
48

42. =5*11
49
55
243
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6

43. =6*6
Pr^2
36
It gets smaller
216

44. SQRT 100
64
72
285
10

45. When is a number divisible by 4?

46. =17*17
289
108
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller - stop when all the places are taken
3:4:5 -- 5:12:13 -- 7:24:25

47. =4*15
36
729
9
60

48. =17*19
323
108
Undefined
102

49. =9*19
39
121
Difference in the y-coordinates over the difference in the x coodinates
171

50. =6*13
729
78
238
59 -049