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. Key to percent increase/decrease
7
1 -000 -000
306
Amount of increase/original amount = x/100 (Then cross multiply to find x)


2. SQRT 9
117
625
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)
3


3. Pythagorean Triples (lengths)?
3:4:5 -- 5:12:13 -- 7:24:25
7 -776
100
221


4. =16*20
320
36
46 -656
45


5. How do you find the mode of a set of numbers?
225
Invert (reciprocal) the second fraction and multiply
252
Pick the # that occurs most frequently


6. Exponents - Multiplying numbers with same base
324
Add their exponents (6^2 *6^3 = 6^5)
65
55


7. =2^3
70
8
7 -776
340


8. =14*20
96
The direction of the inequality symbol changes
64
280


9. =15*17
5^(1/3)
12
255
119


10. =4^1
224
4
182
280


11. =7*7
361
Odd
Won't = 1 - Will
49


12. =20*20
400
8
204
225


13. =14*17
Difference in the y-coordinates over the difference in the x coodinates
238
133
39


14. Area of a circle?
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
Pr^2
64
209


15. =4*17
108
68
Add or subtract the numbers on top and keep the same denominator
3


16. SQRT 10 -000 -000 -000
323
40
100 -000
39


17. SQRT 2
27
114
1.414213562
512


18. =9^3
729
96
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller - stop when all the places are taken


19. =4*16
4 -096
45
Subtract the smallest number from the greatest number
64


20. =8*10
84
1 -024
247
80


21. Permutations: single source - order matters BUT only for a selection
42
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller - stop when all the places are taken
Add their exponents (6^2 *6^3 = 6^5)
32


22. 729^(1/3)
9
32
121
81


23. Any number to the first power is?
3
117
Itself
1


24. =15*18
9
44
300
270


25. =13*15
153
625
18
195


26. =4*18
7
It becomes positive
108
72


27. =19*19
361
125
100 -000
Odd


28. =8^3
10 -000 -000
44
125
512


29. =8*15
120
209
3
90


30. =3*10
30
255
25
15


31. =6*19
60
114
108
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)


32. =5*5
52
59 -049
45
25


33. 216^(1/3)
247
4
12
6


34. SQRT 16
4
182
54
81


35. When is a number divisible by 3?
Side - Side - Side^2
128
304
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)


36. SQRT 625
(b*h)/2
25
9
Odd


37. =7^3
84
343
48
112


38. =7*9
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
63
3 -125
25


39. =4*15
126
60
9
10 -000


40. =10^4
125
152
10 -000
Pr^2


41. =3^6
128
729
32
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)


42. =8*18
16
80
380
144


43. =5*9
1 -024
168
153
45


44. Probability that A or B will happen?
It gets smaller
35
A+B (Add both probabilities)
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)


45. =9^2
4
81
70
Amount of increase/original amount = x/100 (Then cross multiply to find x)


46. =9*18
162
30
114
60


47. Does (x^2 + y^2 + z^2)/(x^2 + y^2) = z^2?
NO
100 -000
512
104


48. Area of a triangle?
400
324
(b*h)/2
320


49. 512^(1/3)
48
8
16
Odd


50. =12*18
216
225
228
A+B (Add both probabilities)