Mathematical formulas Flashcards
1
Q
divisibility 3,4,5,6,8,9
A
3 digits divisible by 3
4 last two digits divisible by 4
5 last digit divisible by 5 or 0
6 even numbers and sum of digits divisible y 3
8 if last three digits are divisible by 8
9 sum of digits divisible by 9
2
Q
|x|
A
-x, +x
3
Q
1 billion
A
1000 million
4
Q
a square - b square
A
(a-b) (a+b)
5
Q
(a-b)square
A
a square - 2ab+ b square
6
Q
|x|>3
A
x>3, x
7
Q
polygons’ side
A
180 (n-2)/n
8
Q
45-45-90
A
x:x:xroot2
9
Q
30-60-90
A
x:xroot3:2x
10
Q
area of trapezoid
A
base 1 + base 2/ 2*height
11
Q
volume of cube
surface area of cube
A
s square
6 side square
12
Q
rectangular solid
A
heightdepthwidth
13
Q
the surface area of a rectangle
A
2 * height *width + 2 * width * depth + 2 * depth * height
14
Q
cylinder volume
A
r square pie height
15
Q
surface area of cylinder
A
2 pie r (r + h)
