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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. =14*20
280
85
If the number formed by it's last 2 digits is divisible by 4 (3 -028 is because 28 is divisible by 4)
6

2. SQRT 2
1.414213562
78
176
238

3. =4*5
1 -296
63
20
9

4. =6*17
234
102
1 -024
42

5. Pythagorean Triples (lengths)?
57
102
27
3:4:5 -- 5:12:13 -- 7:24:25

6. =10^3
NO
Subtract the smallest number from the greatest number
168
1 -000

7. =9*13
108
285
10 -000 -000 -000
117

8. Key to percent increase/decrease
306
Amount of increase/original amount = x/100 (Then cross multiply to find x)
5
133

9. If you raise a negative number to an even power - what happens to the number?
625
1 -000 -000
It becomes positive
512

10. =4*17
320
68
65
255

11. SQRT 100
11
56
10
270

12. Any number to the negative power (y) is equal to?
80
Line up the decimal points and proceed as usual
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)
Move the decimal to the right on both numbers until there is nothing to the right of the decimal

13. =13*14
57
36
182
225

14. =3*14
27
112
133
42

15. =9*17
153
8
32
36

16. SQRT 100 -000 -000
4
20
10 -000
187

17. =6*10
76
60
72
20

18. =9^3
512
729
60
32

19. =12*14
144
60
168
221

20. =8*15
10
64
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)
120

21. Does (x^2 + y^2 + z^2)/(x^2 + y^2) = z^2?
80
36
NO
48

22. =4^6
4 -096
68
3
1 -000

23. =10^9
160
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
256
1 -000 -000 -000

24. =20*20
90
24
10 -000 -000
400

25. Dividing Fractions
224
Multiply the numerators and put the product over the product of the denominators
Invert (reciprocal) the second fraction and multiply
7

26. =4*20
32
32
96
80

27. =13*17
Move the decimal to the right on both numbers until there is nothing to the right of the decimal
221
72
Add their exponents (6^2 *6^3 = 6^5)

28. 4/0 =
Even
256
Undefined
256

29. Basic probability formula?
16
Number of outcomes you want/total number of possible outcomes
15
63

30. Area of a circle?
260
171
9
Pr^2

31. =14*17
238
135
64
3 -125

32. =3^5
16
33
243
80

33. =2^8
256
95
126
120

34. =5^3
125
Add their exponents (6^2 *6^3 = 6^5)
729
25

35. Does x^2 + x^3 = x^5?
32
320
180
NO

36. =9*20
50
300
180
280

37. =9*11
99
171
Add or subtract the numbers on top and keep the same denominator
56

38. =5*11
64
55
Rate * Time = Distance (Hint: Draw a chart)
361

39. =15*16
240
2
324
72

40. =7*19
210
260
133
52

41. =12*16
192
323
10 -000 -000
729

42. SQRT 1 -296
36
Pr^2
Multiply the # of choices for each of the spots
80

43. =9*9
48
49
The reciprocal of the same number to the positive power (y). (eg 3^-2 = 1/(3^2) = 1/9)
81

44. SQRT 3
10 -000
133
25
1.732050808

45. SQRT 400
20
Even
323
Itself

46. =7*20
Side - Side - Side^2
140
729
Won't = 1 - Will

47. =8*18
1.732050808
144
100 -000
340

48. =8*9
66
72
50
56

49. =8*16
It gets smaller
128
64
169

50. SQRT 6 -561
Permutations ask for 'arraingements' Combinations ask for 'Groups'
81
85
18