This Giveaway is sponsored by MacAppsOnSale.com. Solve is a calculator like no other! Whether you need a simple calculator for everyday use or a graphing calculator for high school math, Solve is everything you'll ever need in a calculator app. Featuring an innovative memory system to store and recall answers, Solve has four tabs that select four different calculators each with its own color. Multiply numbers, plot a graph and solve an equation all without clearing your results! Solve is also available for iPhone and iPad on the App Store!