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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*7
NO
Subtract the smallest number from the greatest number
Combinations don't care about the order of the problems
35

2. If you raise a negative number to an odd power - what happens to the number?
It gets smaller
27
Will = 1 - Won't
2 -401

3. =5*8
40
25
9
1

4. =9*9
81
18
64
144

5. =14*16
224
340
Amount of increase/original amount = x/100 (Then cross multiply to find x)
152

6. Area of a triangle?
238
260
(b*h)/2
36

7. =13*18
16
1 -000
119
234

8. =12*19
100 -000
48
32
228

9. =13*20
343
25
260
4 -096

10. =3*9
10
27
238
289

11. =5*9
304
343
25
45

12. SQRT 729
Add or subtract the numbers on top and keep the same denominator
243
27
256

13. SQRT 25
512
24
x:x^(1/3):2x
5

14. =4*17
68
52
45
90

15. even + even =
Rate * Time = Distance (Hint: Draw a chart)
196
Even
Number of outcomes you want/total number of possible outcomes

16. Exponents - Multiplying numbers with same base
143
Odd
NO
Add their exponents (6^2 *6^3 = 6^5)

17. SQRT 400
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)
NO
20
55

18. SQRT 16
119
512
4
1 -000 -000 -000

19. =6*15
15
NO
90
1.732050808

20. SQRT 36
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)
6
9
44

21. 729^(1/3)
143
9
8
Multiply both fractions to get a common denominator add or subtract as usual

22. =3^5
6
266
48
243

23. =7*14
400
5^(1/3)
81
98

24. =9^1
125
16
9
324

25. =9^3
Even
70
729
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)

26. =4^5
Odd
125
64
1 -024

27. =19*20
380
114
272
32

28. When is a number divisible by 3?
48
6 -561
343
If the sum of its can be divided evenly by 3 (216 - is because 2+1+6 is divisible by 3)

29. Order of operations
PEMDAS (parenthesis - Exponents - Multiplication - Division - Addition - Subtraction)
320
100 -000
84

30. multiplying decimals
4
Add their exponents (6^2 *6^3 = 6^5)
64
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

31. =6*17
9
56
102
10

32. =4^2
16
128
42
4

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

34. Pythagorean Triples (lengths)?
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)
Invert (reciprocal) the second fraction and multiply
3:4:5 -- 5:12:13 -- 7:24:25
198

35. =16*20
180
1 -296
320
10

36. =6*12
36
13
33
72

37. =3*15
45
7 -776
108
81

38. If you raise a negative number to an even power - what happens to the number?
It becomes positive
168
8
2

39. =4*8
32
Subtract the bottom exponents from the top exponents (3^6 / 3^2 = 3^4)
90
Permutations ask for 'arraingements' Combinations ask for 'Groups'

40. =11^2
288
100
121
144

41. =7*16
100
400
112
198

42. =3^4
112
168
140
81

43. =5*12
182
625
60
x:x^(1/3):2x

44. 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)
187
208
210

45. =2^7
128
Odd
729
70

46. how do you find the range of a set of numbers?
55
77
114
Subtract the smallest number from the greatest number

47. SQRT 2 -401
256
49
32
2

48. =13*16
2 -401
56
729
208

49. =5*10
78
50
512
It becomes positive

50. =7^1
5^(1/3)
7
80
Difference in the y-coordinates over the difference in the x coodinates