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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. =9*16
2pr
108
144
25

2. SQRT 81
56
5^(1/3)
7
9

3. =9^4
108
Combinations don't care about the order of the problems
625
6 -561

4. =8^3
42
512
119
55

5. =7^2
15
Undefined
49
Odd

6. Circumference of a circle?
2pr
30
Multiply the numerators and put the product over the product of the denominators
Permutations ask for 'arraingements' Combinations ask for 'Groups'

7. Does x^6 - x^2 = x^4?
Number of outcomes you want/total number of possible outcomes
105
NO
80

8. =8*18
100
64
56
144

9. =7*11
66
77
7 -776
1 -000 -000 -000

10. Adding and Subtracting Decimals
Line up the decimal points and proceed as usual
45
44
84

11. =5^2
400
39
240
25

12. =6*17
27
102
120
1.414213562

13. SQRT 400
Base * Height
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
40
20

14. =4^5
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
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
1 -024
3

15. =9^3
156
256
60
729

16. =12*20
Arrainge #s from least to greatest and take the middle number or the average of the two middle #s
240
729
729

17. =3*5
182
15
28
Permutations ask for 'arraingements' Combinations ask for 'Groups'

18. =10^2
10 -000 -000
100
8
256

19. =7*13
80
180
91
144

20. =11*20
4
56
16
220

21. =16*17
272
Invert (reciprocal) the second fraction and multiply
81
48

22. Adding or subtracting fractions with different denominators
Multiply both fractions to get a common denominator add or subtract as usual
A*B (Multiply both probabilities)
55
20

23. =13*20
100 -000
260
x:x^(1/3):2x
512

24. =9*11
240
5^(1/3)
99
256

25. =2^9
16
2pr
280
512

26. How do you tell if it's a permutation or combination?

27. =12*13
156
20
Multiply the # of choices for each of the spots
24

28. Pythagorean Triples (lengths)?
209
3:4:5 -- 5:12:13 -- 7:24:25
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
256

29. =4*7
3
64
28
81

30. =12*15
180
Undefined
24
49

31. SQRT 10 -000 -000 -000
100 -000
380
9
400

32. =2^3
285
8
Even
1

33. Any number to the negative power (y) is equal to?
54
100 -000 -000
7
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)

34. =6*16
96
2
5
81

35. SQRT 169
100
13
0 (any fraction with 0 on top is 0)
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6

36. SQRT 2 -401
18
49
112
60

37. Permutations: single source - order matters
195
140
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller
256

38. =6^3
216
60
119
88

39. =8^3
512
Line up the decimal points and proceed as usual
49
104

40. =5*10
49
A+B (Add both probabilities)
50
340

41. =17*18
121
306
169
225

42. =5*5
255
Arrainge #s from least to greatest and take the middle number or the average of the two middle #s
28
25

43. SQRT 4
300
36
204
2

44. Another way to write cube root 5
5^(1/3)
3:4:5 -- 5:12:13 -- 7:24:25
5
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)

45. =6*11
119
66
6
1

46. =5*17
15
85
49
100 -000

47. When is a number divisible by 6?
221
3:4:5 -- 5:12:13 -- 7:24:25
285
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)

48. =3^4
81
210
56
247

49. =9*13
65
Multiply the numerators and put the product over the product of the denominators
Number of outcomes you want/total number of possible outcomes
117

50. When is a number divisible by 4?