How to increment or decrement the selected number in Sublime Text 3

Question

I'm using Sublime Text 3 as a text editor. I need a shortcut way to save time by incrementing or decrementing the selected number.

Answer 1

When I press Alt+Up next to a number, it gets incremented by 0.1, Cmd+Alt+Up increments it by 10. I'm not sure whether that's default behaviour, I couldn't identify any plugins to be reponsible for this. However, there are several packages available from incrementing numbers.