Here's another one:

Start by putting your game
piece on the 18...

Now, move up
6 places (since it's
+6)...
Just like you'd do on a board game if you rolled a 6
on the dice:

We land on the
24...

Yeah, you're still counting up... But,
if you practice this a lot, you'll soon be jumping up in chunks.
It won't be long before you start to see the
answer up in your head! Why? Because you'll see the yardstick up
in your head and you'll just be able to THINK about the numbers!
Check out
The Number
Monster for practice with yardstick numbers!