What does single parentheses mean?

Question

I see look at Changing a number between arbitrary bases, Math Gems answer and see such annotation : 1⋅6+2=10)6=60)+1)=61)6=446)+3=451

What does 10)6 mean? What single ")" mean? Mathematics teacher not taught us about it..

Answer 1

It appears to me they are closing parentheses. He is trying to show the steps in evaluating $\ ((1\cdot 6+{\color{red}2})\:6+{\color{blue}1})\:6 + {\color{orange}3}$ in base $8$. He starts with the inner parenthesis and states $1\cdot 6+{\color{red}2}=10$ The next step is to multiply this $10$ by $6$, but he has not shown the opening parenthesis. I would say it is not standard notation, but seems to me a useful way to show what is going on.