Do your maths or whatever using this calculator! It can do addition and subtraction.

How to install a Bedrock Edition world:
-search up com.mojang using a file browser
-move the zip file you downloaded here into the MinecraftWorlds folder
-unzip it
-get rid of the zip file
-PLAY

How to use the calculator:
You can set the 2 operands using the 32 levers. Use the 33rd lever in the middle to set the operator. After a while, the calculator will show the output. Remember that the numbers are represented in binary, with lit redstone torches being 1s and unlit redstone torches being 0s.