Concepts Flashcards
1
Q
Divisibility Rule: 3
A
Sum of digits is divisible by 3
2
Q
Divisibility Rule: 6
A
Sum of digits is divisible by 3 and 2
3
Q
Divisibility Rule: 4
A
If last two digits for a number that is divisible by 4 (i.e. 1812)
4
Q
Divisibility Rule: 9
A
Sum of digits is divisible by 9
5
Q
x^2 - y^2
A
(x + y)(x - y)
6
Q
(x + y)(x - y)
A
x^2 - y^2
7
Q
x^2 + 2xy + y^2
A
(x + y)(x + y) = (x + y)^2
8
Q
(x + y)(x + y) = (x + y)^2
A
x^2 + 2xy + y^2
9
Q
x^2 - 2xy + y^2
A
(x - y)(x - y) = (x - y)^2
10
Q
(x - y)(x - y) = (x - y)^2
A
x^2 - 2xy + y^2
11
Q
Primes through 30
A
2, 3, 5, 7, 11, 13, 17, 19, 23, 29
12
Q
2 Cubed
A
8
13
Q
Cube root of 8
A
2
14
Q
3 Cubed
A
27
15
Q
Cube root of 27
A
3
16
Q
4 Cubed
A
64
17
Q
Cube root of 64
A
4
18
Q
5 Cubed
A
125
19
Q
Cube root of 125
A
5
20
Q
6 Cubed
A
216
21
Q
Cube root of 216
A
6
22
Q
Simple interest formula
A
value of investment = amount invested (1 - rate*time/100)
