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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. When is a number divisible by 6?
80
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
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)
75

2. =14*19
104
Permutations ask for 'arraingements' Combinations ask for 'Groups'
266
45

3. SQRT 1 -296
Invert (reciprocal) the second fraction and multiply
36
64
512

4. =2^2
228
64
40
4

5. =20*20
1
64
400
289

6. =3*4
It becomes positive
Rate * Time = Distance (Hint: Draw a chart)
12
225

7. =12*20
40
57
1.732050808
240

8. Factor x^2-2xy+y^2
1 -296
204
128
(x-y)^2

9. =3*12
52
136
36
Add their exponents (6^2 *6^3 = 6^5)

10. Key to percent increase/decrease
280
Invert (reciprocal) the second fraction and multiply
Amount of increase/original amount = x/100 (Then cross multiply to find x)
91

11. =5*16
9
80
240
180

12. =6*16
128
Add their exponents (6^2 *6^3 = 6^5)
13
96

13. =8^3
84
165
512
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)

14. even + odd =
117
Combinations don't care about the order of the problems
104
Odd

15. =14*16
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
NO
224
90

16. =4*9
198
Line up the decimal points and proceed as usual
36
A+B (Add both probabilities)

17. =7*14
25
Permutations ask for 'arraingements' Combinations ask for 'Groups'
3
98

18. multiplying decimals
100
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
210
7

19. 216^(1/3)
6
Even
Line up the decimal points and proceed as usual
42

20. =7*13
625
91
72
2 -401

21. =9^2
81
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller
30
7 -776

22. =4*18
380
72
32
64

23. =7*12
84
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller
55
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)

24. =9*19
32
72
196
171

25. =11*19
209
400
8
Rate * Time = Distance (Hint: Draw a chart)

26. =9*9
Even
15
10
81

27. =9*14
126
84
4
52

28. =15*19
285
78
8
143

29. =4*7
28
24
48
144

30. =6*10
60
56
One (1)
10 -000 -000

31. Probability that A and B will both happen?
A*B (Multiply both probabilities)
NO
0 (any fraction with 0 on top is 0)
30

32. =7*15
Odd
36
105
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)

33. When is a number divisible by 3?
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
3
98

34. =8*10
340
80
2
16

35. Adding or subtracting fractions with different denominators
Arrainge #s from least to greatest and take the middle number or the average of the two middle #s
48
Multiply both fractions to get a common denominator add or subtract as usual
64

36. =7*11
12
77
2pr
Side - Side - Side^2

37. =5*17
625
64
85
72

38. =2^1
52
32
361
2

39. =10^7
Multiply the numerators and put the product over the product of the denominators
10 -000 -000
35
5^(1/3)

40. SQRT 49
Move the decimal to the right on both numbers until there is nothing to the right of the decimal
36
7
10

41. =14*17
72
238
8
182

42. Odds that something doesn't happen?

43. =1^3
54
0 (any fraction with 0 on top is 0)
1
195

44. =9*10
0 (any fraction with 0 on top is 0)
208
90
NO

45. even x even =
57
80
Even
100 -000

46. =2^9
360
512
266
44

47. =3^3
24
72
42
27

48. =9*15
135
36
Add or subtract the numbers on top and keep the same denominator
84

49. =5^2
57
25
300
3 -125

50. Permutations: single source - order matters
81
(x-y)^2
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller