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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. Area of a circle?
Pr^2
7
5
119

2. Circumference of a circle?
2pr
45
6
180

3. Equation for a line?
NO
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
304
729

4. =7*16
30
56
112
162

5. =6^3
512
210
216
Multiply the numerators and put the product over the product of the denominators

6. How do you find the slope of a line?
221
3:4:5 -- 5:12:13 -- 7:24:25
64
Difference in the y-coordinates over the difference in the x coodinates

7. =9^3
108
63
108
729

8. =3*18
3
54
Amount of increase/original amount = x/100 (Then cross multiply to find x)
225

9. =10^7
10 -000 -000
36
54
125

10. =9*14
126
59 -049
104
256

11. Area of a parallelogram?
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller - stop when all the places are taken
Base * Height
48
512

12. =2^4
100 -000
39
85
16

13. =4^4
280
Multiply the numerators and put the product over the product of the denominators
4
256

14. SQRT 25
340
8
196
5

15. When is a number divisible by 4?
323
3:4:5 -- 5:12:13 -- 7:24:25
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
114

16. =12*17
8
Odd
42
204

17. 64^(1/3)
6 -561
55
Add or subtract the numbers on top and keep the same denominator
4

18. =7*10
48
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
70
Side - Side - Side^2

19. SQRT 6 -561
63
2
187
81

20. =5*7
35
243
256
105

21. =5*6
30
10
0 (any fraction with 0 on top is 0)
125

22. =2^2
256
4
120
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)

23. =15*17
90
255
x:x^(1/3):2x
125

24. =4*10
228
96
40
One (1)

25. Basic probability formula?
39
91
Number of outcomes you want/total number of possible outcomes
153

26. =6^5
7 -776
36
180
Add or subtract the numbers on top and keep the same denominator

27. =17*20
256
102
340
36

28. =5*5
1 -024
1 -000
Arrainge #s from least to greatest and take the middle number or the average of the two middle #s
25

29. SQRT 10 -000 -000 -000
100 -000
128
27
204

30. =6*14
361
64
84
360

31. =12*13
2
It becomes positive
A*B (Multiply both probabilities)
156

32. =12*20
100 -000
152
240
361

33. When is a number divisible by 3?
2
25
625
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)

34. =9*18
162
10
55
108

35. Permutations: single source - order matters
240
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller
105
165

36. =4*20
64
323
80
65

37. =5*8
27
204
40
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)

38. =8^2
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
7
1.414213562
64

39. =4*17
68
125
Even
Line up the decimal points and proceed as usual

40. =15*16
121
27
240
85

41. multiplying decimals
2
64
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
10 -000

42. When is a number divisible by 4?
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
288
243
Side - Side - Side^2

43. =7*20
76
105
140
36

44. SQRT 49
51
25
7
2pr

45. =16*18
288
48
343
Invert (reciprocal) the second fraction and multiply

46. Adding and Subtracting Decimals
120
7
Line up the decimal points and proceed as usual
40

47. =4^1
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller
Difference in the y-coordinates over the difference in the x coodinates
182
4

48. =3*4
50
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
12
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller - stop when all the places are taken

49. Exponents - Multiplying numbers with same base
Add their exponents (6^2 *6^3 = 6^5)
0 (any fraction with 0 on top is 0)
Permutations ask for 'arraingements' Combinations ask for 'Groups'
4

50. Another way to write cube root 5
4
187
90
5^(1/3)

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