Station  8B

Addition and Subtraction 

Performing addition and subtraction with decimals in a $1 \leftarrow 10$ machine is no different from performing addition and subtraction in a $1 \leftarrow 10$ machine without decimals.

For example, here is a picture of $22.37+5.841$.

We see the answer $2|7.11|11|1$. Just add left to right and don’t worry about explosions!

Now with explosions we obtain an answer that society understand. We get $28.211$. (Check this!)
And here is $10.23-4.57$.

We see the answer, after some annihilations, as $1|-4.-3|-4$. (Do you see this?)

Now with some unexplosions, we can fix up this answer for society to read. We get $10.23-4.57=5.66$.
(Check that you follow this.)