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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. Odds that something doesn't happen?
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
A+B (Add both probabilities)
4
Won't = 1 - Will

2. =8*13
4
121
104
It becomes positive

3. =7*12
84
270
Add their exponents (6^2 *6^3 = 6^5)
16

4. Multiplying Fractions
323
Multiply the numerators and put the product over the product of the denominators
Add or subtract the numbers on top and keep the same denominator
208

5. SQRT 6 -561
81
2pr
238
132

6. Probability that A and B will both happen?
360
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
A*B (Multiply both probabilities)
1 -000

7. =15^2
360
300
225
238

8. =5*20
100
48
1.732050808
64

9. SQRT 10 -000 -000 -000
100 -000
8
3
195

10. =8*16
4 -096
260
128
72

11. SQRT 10 -000
1.732050808
100
192
10 -000

12. =5^3
78
125
Combinations don't care about the order of the problems
136

13. =1^3
1
1 -000 -000 -000
729
400

14. =7*14
4
81
56
98

15. If you raise a negative number to an even power - what happens to the number?
It becomes positive
49
Line up the decimal points and proceed as usual
PEMDAS (parenthesis - Exponents - Multiplication - Division - Addition - Subtraction)

16. =9*11
10
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
99
120

17. =3^4
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)
81
68
Even

18. =15*19
It gets smaller
45
60
285

19. =14*15
165
Odd
210
204

20. =10^9
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)
135
75
1 -000 -000 -000

21. =20*20
Move the decimal to the right on both numbers until there is nothing to the right of the decimal
Side - Side - Side^2
78
400

22. Any number to the negative power (y) is equal to?
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)
512
342
105

23. =4^4
256
81
5
8

24. =4*4
16
Permutations ask for 'arraingements' Combinations ask for 'Groups'
4 -096
252

25. =4^5
270
9
1 -024
49

26. =4*5
252
Will = 1 - Won't
20
32

27. =18*20
12
32
360
7

28. =8*17
Won't = 1 - Will
136
5
56

29. SQRT 1 -000 -000
256
1 -000
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6
729

30. even + odd =
256
Itself
Odd
64

31. =19*19
361
120
9
45

32. =3*16
48
27
285
7 -776

33. =7^2
2pr
49
Move the decimal to the right on both numbers until there is nothing to the right of the decimal
112

34. =4^3
Invert (reciprocal) the second fraction and multiply
40
221
64

35. =3*20
216
144
95
60

36. 343^(1/3)
49
It gets smaller
7
30

37. Order of operations
PEMDAS (parenthesis - Exponents - Multiplication - Division - Addition - Subtraction)
Number of outcomes you want/total number of possible outcomes
5
168

38. =8*14
132
32
112
1.732050808

39. How do you find the median of a set of numbers?
63
46 -656
6
Arrainge #s from least to greatest and take the middle number or the average of the two middle #s

40. =7*17
119
60
48
49

41. =2^10
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
154
1 -024
16

42. What happens if you multiply or divide both sides of an inequality by a negative number?
100 -000
91
The direction of the inequality symbol changes
8

43. =11*13
143
6
1 -000
729

44. =5*10
50
3:4:5 -- 5:12:13 -- 7:24:25
323
81

45. When is a number divisible by 3?
48
5
NO
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)

46. Odds that at least one thing will happen?
208
6 -561
Will = 1 - Won't
153

47. =3*13
1 -000 -000
75
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
39

48. =8^3
162
512
25
256

49. Does (x^2 + y^2 + z^2)/(x^2 + y^2) = z^2?
NO
252
135
Invert (reciprocal) the second fraction and multiply

50. =8^3
80
8
512
135

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