10-digit calculator features an easy-to-use, flash card function, math quiz function and multiplication drills to test and reinforce your student's math skills. Ergonomic shape with easy-grip contours fits comfortably in small hands for easy handling. Compact size fits conveniently in a pocket or backpack for effortless mobility and storage. Large LCD clearly shows each digit to help prevent reading errors. Twin-power operation runs on solar energy with a battery backup to deliver consistent, reliable use in any environment. Handheld calculator also includes percent key, square root, sign change, auto power off and more.