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!