Which equals 29^2 x .01 => ((28 x 30) +1) X .01
=> (840 + 1) x .01 => 8.41
28 x 30 is an easy mental calculation, as is adding 1, as is moving the decimal place over 2 places. I am teaching this to 4th graders, in two weeks. % to decimal is next week. They can square 2-digit numbers in their heads, already.
Reminds me of boxed software, too. You check the compatibility, the features that included one must-have new feature. Buy it and discover what vaporware is. It started me on the ethics of pirating, finding out if it actually works, and then, and only then, buying a real copy. I donate to developers on Linux, now.
The panzer has spoken (sh.itjust.works)
oof (slrpnk.net)