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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. Exponents - Dividing numbers with same base
285
4
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)
16

2. =5*17
121
Multiply the numerators and put the product over the product of the denominators
85
60

3. =7*9
30
63
234
220

4. =4^2
1 -000 -000
16
280
30

5. =4*15
380
343
60
256

6. Key to percent increase/decrease
126
44
Amount of increase/original amount = x/100 (Then cross multiply to find x)
Will = 1 - Won't

7. How do you find the slope of a line?
Difference in the y-coordinates over the difference in the x coodinates
125
1
380

8. =17*20
99
340
A+B (Add both probabilities)
228

9. =3^5
252
243
3
27

10. multiplying decimals
Permutations ask for 'arraingements' Combinations ask for 'Groups'
Multiply the numerators and put the product over the product of the denominators
270
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

11. =8*18
144
153
1.732050808
324

12. Permutations: single source - order matters
32
Multiply the # of choices for each of the spots--but the number of choices keeps getting smaller
28
7 -776

13. =6*11
66
16
Even
32

14. =19*19
361
Odd
NO
Even

15. SQRT 169
13
76
300
33

16. Multiplying Fractions
10 -000 -000 -000
126
Multiply the numerators and put the product over the product of the denominators
32

17. =2^3
76
96
180
8

18. When is a number divisible by 3?
100 -000
27
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
1 -000 -000 -000

19. When is a number divisible by 6?
51
216
15
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)

20. =5*14
70
121
112
2

21. =14*19
266
(b*h)/2
1.732050808
512

22. =3^6
5
76
140
729

23. =8*16
120
11
128
64

24. Exponents - Raising a power to a power
66
Multiply the exponents (4^3)^2 = 4^(3*2) = 4^6
300
Invert (reciprocal) the second fraction and multiply

25. =5^3
84
255
323
125

26. SQRT 10 -000 -000 -000
10
100 -000
5
729

27. =13*18
343
156
Amount of increase/original amount = x/100 (Then cross multiply to find x)
234

28. =11*20
80
220
180
6

29. Pythagorean Triples (lengths)?
Even
Odd
3:4:5 -- 5:12:13 -- 7:24:25
Multiply the # of choices for each of the spots

30. =18*18
1 -000
33
Line up the decimal points and proceed as usual
324

31. =14*14
196
126
28
304

32. =12*14
25
10
168
100 -000 -000

33. =9^3
44
10 -000
729
152

34. =7*8
9
56
204
4

35. =16*16
Undefined
256
100 -000 -000
10 -000

36. =2^9
32
512
NO
27

37. =14*15
36
285
25
210

38. =7^3
343
51
240
4

39. Area of a parallelogram?
234
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
Base * Height
133

40. =3^3
Even
1 -024
90
27

41. SQRT 225
15
49
99
140

42. SQRT 100
10
(b*h)/2
187
1

43. =12*18
10
216
176
Line up the decimal points and proceed as usual

44. =3*12
36
77
182
162

45. Combinations: single source - order doesn't matter
100 -000
8
7
Start with the number of permutations - that is the numerator(top). The Denominator is the number of combinations (eg 432*1)

46. =6*9
6 -561
85
54
32

47. =7^3
Invert (reciprocal) the second fraction and multiply
2
343
Even

48. =12*12
Will = 1 - Won't
80
144
35

49. Right Isosceles triangle (lengths)?
156
144
256
Side - Side - Side^2

50. Odds that at least one thing will happen?

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