I'm not who you replied to, but:
- typing numbers.
- sometimes also: typing really long numbers
- rarely, I'll use the numpad to hold my pinky finger. My control key, arrow key, and backspace key don't like this though.
- I also use the +, -, and Enter keys too.
- Asterisk is handy for multiplication. But slash is definitely not used ever.
- Once in a while I might press the NumLock key. Usually it's pressed in pairs.