[xanderlewis]

Cue the comments about criticism of this calculator being unfair as thinking, for example, that 88*10 = 888 is a ‘very human’ mistake to make.

[aflag]

I got 883, which is also very human. They just forgot to write one of the halves of 8

[lo0dot0]

You can only get an 8 in the rightmost digit of the result by multiples of the rightmost digits, but 08 obviously gets you a 0, so fairly easy to see this is wrong.

(10a+b)(10c+d) = 100ac+10(ad+bc)+bd

[xanderlewis]

Well… I was joking. Even more generally, multiplication by b in base b gives a zero at the end.

[xanderlewis]

… and, in fact, ‘b in base b’ always looks like 10 anyway!