Quant Flashcards
(x + y)2 =
x2 + y2 + 2xy
(x - y)2 =
x2 + y2 - 2xy
(x + y)(x - y) =
x2 - y2
(x - y)
/
(y - x) = ?
and x =/ y
-1
List the prime numbers under 100:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
LCM (x,y) * GCF (x,y) =
LCM = Least Common Multiple
GCF = Greatest Common Factor
LCM (x,y) * GCF (x,y) = xy
LCM (x,y) = xy / GCF (x,y)
GCF (x,y) = xy / LCM (x,y)
How to tell if a number is divisible by 4:
If the last 2 digits are divisible by 4
How to tell if a number is divisible by 6:
If the number’s digits add up to 3, AND it’s an even number
How to tell if a number is divisible by 8:
If the last 3 digits are divisible by 8 (has to be even)
How to tell if a number is divisible by 9:
If the sum of the number’s digits is divisible by 9
How to tell if a number is divisible by 11:
If the sum of the odd-numbered place digits minus the sum of the even-numbered place digits is divisible by 11
How to tell if a number is divisible by 12:
If it’s divisible by both 3 and 4
Formula for division
x/y =
x/y = Quotient + remainder/y
Prime numbers from 10 to 19:
11, 13, 17, 19
0! =
0! = 1
3! =
6
4! =
24
5! =
120
6! =
720
7! =
5,040
8! =
40,320
9! =
362,880
10! =
3,628,800
In decimals, 1/6 =
0.166666
In decimals, 1/7 =
0.142857 142857 etc.
In decimals, 1/8 =
0.125
In decimals, 1/9 =
0.11111111 etc.
In decimals, 1/11 =
0.0909090909 etc.
Prime numbers from 0 to 10:
2, 3, 5, 7
Prime numbers from 20 to 29:
23, 29
Prime numbers from 30 to 39:
31, 37
Prime numbers from 40 to 49:
41, 43, 47
Prime numbers from 50 to 59:
53, 59
Prime numbers from 60 to 69:
61, 67
Prime numbers from 70 to 79:
71, 73, 79
Prime numbers from 80 to 89:
83, 89
Prime numbers from 90 to 99:
97
Square root of 2?
1.41
Square root of 3?
1.73
Square root of 5?
2.24
Square root of 6?
2.45
Square root of 7?
2.65
Square root of 8?
2.83
Square root of 10?
3.16
14 times 14 =
196
15 times 15 =
225
16 times 16 =
256
17 times 17 =
289
18 times 18 =
324
19 times 19 =
361
3^4 =
81
3^5 =
243
3^6 =
729