Quite functional, but 100 + .1 should equal 100.1 – Solve - Graphing Calculator Review

The good: Solve provides most of the functionality you would expect from a basic scientific/graphing calculator, with a simple UI that's pleasant to use. It's not the most powerful thing in the world, but it should be sufficient for mathematics at up to a high school-level. The bad: this calculator app uses raw floating point numbers for calculations rather than an arbitrary precision decimal library, with the result that 100 + .1 equals 100.099999999999994, among other errors. These small inaccuracies compound as you perform more and more operations, which is a problem in particular when calculating things involving dollars and cents. Using Solve involves a minor but nevertheless existent trade-off between convenience and accuracy, and whether it's still worth using depends on how acceptable this is to you.
Review by Wozzing on Solve - Graphing Calculator.