Texas Instruments 108 Basic Solar Calculator
This most basic of calculators, the second on our list from Texas Instruments, is geared towards young schoolchildren who are just starting to learn mathematics. The device is durable, made from high-impact plastic, and performs all of the various math functions; addition, subtraction, multiplication and division. The buttons are easy to press and have a textured surface to keep small fingers from slipping and entering the wrong number or command. The overall aesthetic of the unit has a bit of a retro feel, but then this calculator has been in production in various forms for over 20 years. It's still one of the best basic calculators available. The unit is solar powered and comes with a protective sleeve to keep it safe and clean, even in overstuffed book bags.