But what can we do with the numbers we stored?

We can do math with those numbers.

This next device is called an 'adder'. It adds together two bits.

In decimal, if you were to add 5 + 5, you would carry the 1 over to make
a 10. The same thing happens in binary when we add 1 + 1, we carry over
(or out) a binary 1.

If we have multiple bits we want to add, we can combine these devices by
connecting one's carry in to another's carry out.

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