How can I explain algebra to my son?
user
Algebra is the basic study of operations between numbers.
assistant
Are there any good acronyms to remember the formulas?
user
Yes,  most of them use Greek letters:

Addition and subtraction (commonly written as + and -) 
Exponents (commonly written as the lowercase letter x and raised to the power of other numbers, like x3)
Multiplication and division (commonly written as the lowercase letter x and raised to the power of other numbers, like x2)
Division with a remainder  (commonly written as the lowercase letter x and raised to the power of other numbers, like x3)
Equation of a line in 2-dimensions  (commonly written as the lowercase letter x and raised to the power of other numbers, like x2)
assistant
How can I explain algebra to my son?
user
Algebra is the basic study of operations between numbers.
assistant
Are there any good acronyms to remember the formulas?
user
How about the main ones you will probably need:

a) xn  = x (n – 1) x (n – 2) ... x 3 x 2 x 1

b) xn+1 = xn – 1xn – 1 xn + xn – 1
assistant
How can I explain algebra to my son?