The base across amount for a $5 table is $32 Across, or $5 each on the 4, 5, 9, and 10 and $6 on the 6 and 8. Increasing units on the inside numbers will always bump them up a total of $22, so the next step would be $44 inside, then $66 inside, and so on.
On a $5 table, $22 Inside puts $5 on the 5 and 9 and $6 on the 6 and 8 each. Get comfortable with your units and values for going inside or across the place numbers. Placing bets 'downtown' and 'uptown' means placing the 4, 5, and6 or the 8, 9, and 10 respectively, but is more of an old-school term. 'Two-way hard ways' is what I say when I want to cover all the hard ways bets and also put the dealers up with me so they can play along and win a bigger tip.