More suggestions that I learnt: Put a line at the base of your 1, otherwise it looks like a lowercase l. Plus it helps distinguish it from 7's that aren't cross

More suggestions that I learnt: Put a line at the base of your 1, otherwise it looks like a lowercase l. Plus it helps distinguish it from 7's that aren't crossed out. Same goes for 4's. A lot of people don't make the top into a closed triangle shape. Instead they write it like an unfinished or upside-down h.