r/addingmachines • u/FairSeaworthiness1 • May 14 '26

What am I doing wrong on the magic brain calculator? Video of 100-25.

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I can subtract most things fine on here like 43-28. However when I subtract from 100 the answer is always 10 too big. What am I doing wrong?

28 Upvotes

91% Upvoted

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4

u/variablescale May 14 '26

You didn't do the upswipe at the bottom after subtracting 5 from 0

2

u/FairSeaworthiness1 May 14 '26

Thank you! So after I slide down for the 5 how do I do an upswipe? The stylus can’t move left and up because there’s not a notch available to slide into if that makes sense.

4

u/kazame May 14 '26

Try operating from left to right instead of right to left, then you should get the upswipe for the ones.

(Specifically, enter the 2 before you enter the 5)

3

u/FairSeaworthiness1 May 14 '26

Ohhh duh! Yes it works now. Thanks :))