Company Dan Pleasant created these great apps:
Math Helper: Addition, Math Helper: Subtraction, Math Helper: Multiplication, Math Helper: Division, Math Helper: Factoring, Math Helper: Reducing Fractions, Math Helper: Fractions, Math Helper: Quadratics, Math Helper: Linear Equations, Math Helper: GCD&LCM, Math Helper: Points & Lines, Math Helper: Systems of Equations, and others..
