GMAT Math Memorization

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. Problem that asks you to choose a # of items to fill specific spots - when each spot is filled from a different source?
6
3 -125
Permutations ask for 'arraingements' Combinations ask for 'Groups'
Multiply the # of choices for each of the spots


2. =8*13
Move the decimal to the right on both numbers until there is nothing to the right of the decimal
104
5
A+B (Add both probabilities)


3. =6*14
125
78
84
3


4. =7*19
133
192
Will = 1 - Won't
144


5. =4*6
Multiply the # of choices for each of the spots
24
5^(1/3)
63


6. =6^5
144
7 -776
36
154


7. =7*9
63
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)
Line up the decimal points and proceed as usual
216


8. =2^3
324
36
25
8


9. =7^3
A+B (Add both probabilities)
343
42
209


10. SQRT 625
361
8
25
112


11. SQRT 3
1.732050808
4 -096
39
x:x^(1/3):2x


12. 4/0 =
Won't = 1 - Will
Line up the decimal points and proceed as usual
140
Undefined


13. =20*20
400
Line up the decimal points and proceed as usual
2pr
729


14. SQRT 81
180
5^(1/3)
9
x:x^(1/3):2x


15. =5^3
1 -000 -000
272
55
125


16. =3*4
27
16
625
12


17. =15*19
Multiply the # of choices for each of the spots
42
84
285


18. =7*12
x:x^(1/3):2x
84
72
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)


19. Odds that at least one thing will happen?


20. =13*17
221
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
36
16


21. =9^1
9
165
16
11


22. =16*19
342
143
304
108


23. =8*17
136
Move the decimal to the right on both numbers until there is nothing to the right of the decimal
125
72


24. =12*14
8
285
168
28


25. Does x^6 - x^2 = x^4?
4
2pr
8
NO


26. =5*16
128
Line up the decimal points and proceed as usual
80
Even


27. =2^7
1 -024
228
One (1)
128


28. 512^(1/3)
380
16
8
9


29. =5*19
Base * Height
132
95
Combinations don't care about the order of the problems


30. =2^2
60
3
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller
4


31. When is a number divisible by 6?
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)
Even
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)
729


32. Odds that something doesn't happen?


33. =4*11
288
59 -049
10
44


34. =13*13
0 (any fraction with 0 on top is 0)
64
169
25


35. =5*10
50
40
80
5^(1/3)


36. =9*18
Pick the # that occurs most frequently
3
28
162


37. =9*17
153
4
24
4


38. =6^4
10
105
1 -296
Combinations don't care about the order of the problems


39. =6^3
8
32
216
35


40. SQRT 1 -024
121
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)
180
32


41. =15^2
225
238
91
39


42. =10^10
One (1)
6
10 -000 -000 -000
85


43. odd + odd =
49
182
Even
234


44. =4*18
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
Will = 1 - Won't
A*B (Multiply both probabilities)
72


45. Pythagorean Triples (lengths)?
1 -000 -000 -000
3:4:5 -- 5:12:13 -- 7:24:25
36
1 -000


46. =4^1
8
Line up the decimal points and proceed as usual
Even
4


47. =10^1
10
64
221
4


48. =4*16
64
60
25
25


49. =3*12
36
A+B (Add both probabilities)
42
1 -024


50. =17*17
234
289
121
144