Quite functional, but 100 + .1 should equal 100.1

The good: Solve provides most of the functionality you would expect from a basic scientific/graphing calculator, with a simple UI thats pleasant to use. Its 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 its still worth using depends on how acceptable this is to you.

Wozzing about Solve - Graphing Calculator, v5.1.2