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# Thread: Mechanical calculator trying to divide by zero

1. ## Mechanical calculator trying to divide by zero

Mechanical calculator tries to divide by zero, in GIF and short video.

https://diqn32j8nouaz.cloudfront.net...ng_by_zero.gif

We don't know exactly why this is happening with this specific Facit ESA-01 mechanical calculator, but it might have to do with how some mechanical calculators use subtraction to perform division. Like this:

20 ÷ 4 = ?

1. 20 - 4 = 16
2. 16 - 4 = 12
3. 12 - 4 = 8
4. 8 - 4 = 4
5. 4 - 4 = 0

5 steps are used to get to zero above. Thus, 20 ÷ 4 = 5. So here's the problem when using subtraction when dividing by 0:

20 ÷ 0 = ?

1. 20 - 0 = 20
2. 20 - 0 = 20
3. 20 - 0 = 20
4. 20 - 0 = 20
5. 20 - 0 = 20
6. 20 - 0 = 20
7. 20 - 0 = 20

etc...

2. ## The Following 2 Users Say Thank You to Jon For This Useful Post:

PJs (Jan 12, 2017), Seedtick (Jan 15, 2017)

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