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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. =6*17
144
68
64
102

2. 4/0 =
Undefined
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller - stop when all the places are taken
102
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

3. =10^5
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6
100 -000
36
260

4. 30:60:90 Right Triangle (Lenghts)
16
144
255
x:x^(1/3):2x

5. Dividing Fractions
168
1.414213562
42
Invert (reciprocal) the second fraction and multiply

6. even x even =
Even
Rate * Time = Distance (Hint: Draw a chart)
4
221

7. =3^3
27
204
One (1)
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)

8. =19*20
36
380
6
13

9. Adding and Subtracting Decimals
Line up the decimal points and proceed as usual
8
4 -096
16

10. =5*14
70
60
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)
Permutations ask for 'arraingements' Combinations ask for 'Groups'

11. =3*4
12
55
25
81

12. 0/1 =
0 (any fraction with 0 on top is 0)
121
196
512

13. =4*15
Difference in the y-coordinates over the difference in the x coodinates
60
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)

14. =18*20
11
360
NO
120

15. =8^3
512
36
198
154

16. =10^3
Multiply the # of choices for each of the spots
512
1 -000
Move the decimal to the right on both numbers until there is nothing to the right of the decimal

17. When is a number divisible by 6?
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)
180
44
221

18. =8*17
Pick the # that occurs most frequently
33
48
136

19. =4*4
3
16
Add or subtract the numbers on top and keep the same denominator
5^(1/3)

20. =14*19
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)
266
Amount of increase/original amount = x/100 (Then cross multiply to find x)
35

21. =4^3
343
64
78
108

22. =14*18
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6
10
204
252

23. SQRT 121
18
1.414213562
11
Move the decimal to the right on both numbers until there is nothing to the right of the decimal

24. =16*20
2
16
320
Even

25. =9^4
6 -561
70
24
Multiply both fractions to get a common denominator add or subtract as usual

26. Area of a parallelogram?
210
Base * Height
9
234

27. SQRT 100
10
192
72
1 -024

28. Combinations: single source - order doesn't matter
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)
60
It becomes positive
625

29. Distance Formula?
99
8
100
Rate * Time = Distance (Hint: Draw a chart)

30. =9*13
9
176
117
240

31. multiplying decimals
20
180
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
5

32. =18*18
36
324
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)
10 -000 -000

33. =14*17
238
64
It gets smaller
Even

34. =5^5
3 -125
35
221
42

35. If you raise a negative number to an odd power - what happens to the number?
3
256
12
It gets smaller

36. =14*20
85
128
280
256

37. =2^3
1 -296
10 -000 -000 -000
8
343

38. Probability that A and B will both happen?
63
A*B (Multiply both probabilities)
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)
52

39. =13*20
2 -401
45
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
260

40. When is a number divisible by 4?

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41. =25^2
A+B (Add both probabilities)
1 -000 -000
102
625

42. =3*20
120
84
64
60

43. Does x^6 - x^2 = x^4?
NO
44
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)
100 -000 -000

44. SQRT 169
48
220
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
13

45. =4*9
49
36
54
100 -000 -000

46. =6^2
42
36
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6
98

47. =15^2
225
10
Difference in the y-coordinates over the difference in the x coodinates
27

48. even + odd =
Odd
225
100
135

49. =12*18
153
0 (any fraction with 0 on top is 0)
60
216

50. 27^(1/3)
10
57
3
48