Basic Calculator - Unreal Engine - Blueprints/UMG

My Calculator app made on UE4 version 4.8. Android build works fine with touch input. Made completely with blueprints and UMG. Calculator capable of plus, minus, multiply and divide calculations. I have included overview of entire blueprint graphs. Pause video and take a look...Hope it helps!

Accuracy of calculations will occasionally give erratic results; e.g. 0.1 + 0.5 = 0.6000004 or 0.33 + 2 = 2.228 Any advice for improvement/optimization is welcome as i still have a lot to learn. I know that using UE4 to develop a calculator is major overkill, but it is a fun project to learn from and to get used to the blueprint system. ... https://www.youtube.com/watch?v=cJICy_o5ljs