Press L to increase the value of the left number by 1, press R to do the same but for the right number, press N to decrease the left number by 1 and F for the same thing but for the right number, press D, S, A, or M to divide, subtract, add or multiply the numbers, or if you're on mobile, tap the operation sign to change and tap the grey buttons with arrows to change the value of the left or right numbers by 1 or -1.
A simple, basic, calculator. Nothing else to see here. Update Note: I've added in a modulo operation, which you can access by pressing r on your keyboard, also, now you have to press t to increase the right number.
