Cubing

Main formula: (a+b)^3 = a^3 + 3a^2b + 3ab^2 + b^3

Special trick for integers that end in 5:
(n5)^3 = (2n+1)(500(n)(n+1) + 125)

Example: 65^3 = 13(500(6)(7) + 125) = 13(21125) = 274625