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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. =13*19
247
30
1 -000 -000 -000
96

2. =6*20
120
171
108
36

3. =7*20
Even
140
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)
143

4. =9*12
108
Pick the # that occurs most frequently
39
304

5. =6*8
324
Rate * Time = Distance (Hint: Draw a chart)
48
0 (any fraction with 0 on top is 0)

6. Exponents - Multiplying numbers with same base
45
216
84
Add their exponents (6^2 *6^3 = 6^5)

7. =6*12
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
90
64
72

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

9. =5*11
55
Will = 1 - Won't
108
266

10. =18*20
1.414213562
360
128
0 (any fraction with 0 on top is 0)

11. Dividing Decimals
Move the decimal to the right on both numbers until there is nothing to the right of the decimal
126
144
4

12. =9*19
128
171
84
52

13. =4*12
48
4
121
3 -125

14. =14*18
343
252
7
256

15. =3*13
208
8
1 -296
39

16. SQRT 2
3
1.414213562
3:4:5 -- 5:12:13 -- 7:24:25
Difference in the y-coordinates over the difference in the x coodinates

17. =2^8
256
15
2
Move the decimal to the right on both numbers until there is nothing to the right of the decimal

18. If you raise a negative number to an even power - what happens to the number?
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)
It becomes positive
247
48

19. =3*5
198
15
165
6

20. =4*15
10
238
60
256

21. =6^3
216
64
16
15

22. How do you find the mode of a set of numbers?
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6
81
64
Pick the # that occurs most frequently

23. =13*18
234
126
168
256

24. =8*17
136
112
104
270

25. =2^3
6
260
Add their exponents (6^2 *6^3 = 6^5)
8

26. =2^5
32
2
52
3

27. =11^2
84
Multiply the numerators and put the product over the product of the denominators
121
10 -000

28. =3*15
182
160
102
45

29. Factor x^2-2xy+y^2
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
(x-y)^2
220
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)

30. =6*6
512
144
36
4

31. =15*18
36
270
360
1 -000 -000 -000

32. =7*9
63
45
8
70

33. SQRT 169
13
195
Line up the decimal points and proceed as usual
51

34. =11*15
64
Line up the decimal points and proceed as usual
24
165

35. =16*17
64
272
88
It gets smaller

36. Exponents - Dividing numbers with same base
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)
5
Number of outcomes you want/total number of possible outcomes
49

37. =8*13
95
6
104
Pr^2

38. When is a number divisible by 4?

39. =3*9
320
27
144
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller - stop when all the places are taken

40. =4^4
100
PEMDAS (parenthesis - Exponents - Multiplication - Division - Addition - Subtraction)
260
256

41. =5*10
27
240
PEMDAS (parenthesis - Exponents - Multiplication - Division - Addition - Subtraction)
50

42. =19*20
5
162
187
380

43. SQRT 6 -561
59 -049
81
64
30

44. =3*20
8
60
40
182

45. =4*4
100
4
1.732050808
16

46. =5*17
85
59 -049
126
1 -000

47. odd x odd =
153
80
6 -561
Odd

48. =12*17
75
400
204
Arrainge #s from least to greatest and take the middle number or the average of the two middle #s

49. =8*18
96
6
144
81

50. =3*12
5^(1/3)
36
68
A*B (Multiply both probabilities)