My friends and I built a Sig Figs calculator. Suggestions/Thoughts wanted

A note:

6 x 6 = 40

I was taught to read 40 at 4.0 * 10^1 which has two sig figs. 4 * 10^1 would have 1 sig fig. I can not a web reference which uses 40 as a one sig fig notation with only a few minutes time. You might want to add to your explanation why 40 and similar numbers are to be considered one sig fig if you are using a different style of notation.

40 is 1 sig fig. you have to add a decimal (40.) to make it 2 sig figs. Thanks for the input, we will update.

I do not believe that had ever been emphasized, definitely never tested/quizzed on, in any of my courses.

Clickable: http://sigfigscalculator.appspot.com/

what does 6 times 6 equal to when you run it?

6 x 6 = 36. If you have only 1 significant figure then it equals 40. 6.0 x 6.0 would equal 36.