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The keyboard on this calculator has the number of keys reduced to the minimum by the use of only three function keys, including a combined "x÷" key.

Here, pressing "x÷" gives the multiplication function if "+=" is subsequently pressed to give the answer, and gives the division function if "-=" is subsequently pressed to give the answer, so:

4 x÷ 2 += gives the answer 8. 4 x÷ 2 -= gives the answer 2.






nice concept but a very bad choice to illustrate good UI. there is enough space to add a few more buttons with dedicated functions.

In 2025, sure. Back when that calculator came out, this kind of saving was probably worth it.

eh why? believe it or not but they had even keyboards back then with many dozens of keys.



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