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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. =5*11
306
The direction of the inequality symbol changes
120
55

2. multiplying decimals
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
Combinations don't care about the order of the problems
1 -000 -000
104

3. Dividing Decimals
Move the decimal to the right on both numbers until there is nothing to the right of the decimal
33
102
15

4. Adding and Subtracting Decimals
75
176
Line up the decimal points and proceed as usual
4

5. =3*14
42
243
27
72

6. =7*14
98
78
44
9

7. Dividing Fractions
Invert (reciprocal) the second fraction and multiply
192
95
75

8. Key to percent increase/decrease
121
Amount of increase/original amount = x/100 (Then cross multiply to find x)
168
220

9. =10^1
323
144
16
10

10. =12*14
20
266
256
168

11. Combinations: single source - order doesn't matter
105
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)
Will = 1 - Won't
154

12. =14*16
8
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)
224
Pick the # that occurs most frequently

13. Exponents - Multiplying numbers with same base
66
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
Add their exponents (6^2 *6^3 = 6^5)
Even

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

15. =13*19
247
180
8
100 -000

16. Area of a circle?
Pr^2
x:x^(1/3):2x
112
625

17. =6*15
24
90
125
320

18. Any number to the 0 power is?
46 -656
168
625
One (1)

19. =19*19
361
39
60
Won't = 1 - Will

20. Odds that at least one thing will happen?

21. Pythagorean Triples (lengths)?
3:4:5 -- 5:12:13 -- 7:24:25
1 -000
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller
36

22. =5*5
99
25
88
Side - Side - Side^2

23. SQRT 6 -561
144
182
Even
81

24. =6*18
117
108
126
99

25. =12*18
6
36
216
24

26. =17*18
306
x:x^(1/3):2x
44
64

27. =11^2
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
121
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
48

28. =3*19
57
(x-y)^2
64
180

29. =18*20
360
240
Rate * Time = Distance (Hint: Draw a chart)
25

30. =2^3
10 -000
8
72
220

31. =11*12
204
132
2 -401
55

32. 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)
112
304
256

33. =2^7
120
10 -000 -000 -000
64
128

34. =10^3
99
112
1 -000 -000 -000
1 -000

35. =6^3
216
16
117
0 (any fraction with 0 on top is 0)

36. =5*10
Side - Side - Side^2
90
50
1.732050808

37. =13*13
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
169
Even
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)

38. =9*20
180
100
A+B (Add both probabilities)
81

39. =8*8
Undefined
72
4
64

40. What is the difference between a permutation or a combination?

41. =7*12
84
Pr^2
192
24

42. =11*15
64
165
Multiply the numerators and put the product over the product of the denominators
20

43. =4*17
228
208
64
68

44. =4*9
100
4
81
36

45. =3^3
27
238
180
140

46. =18*19
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
13
342
96

47. =14*17
30
238
45
36

48. =3*4
220
243
Combinations don't care about the order of the problems
12

49. =4^3
64
Odd
45
225

50. =3^3
54
27
50
512