You could just go at it the other way. Guess-and-check is one of the basic math strategies taught in schools, and is easy to apply to these questions:
'I need something to answer this... 0.10 sounds good, but let's check it first. 1+0.1 means the bat costs 1.10, and 1.10+0.10 = 1.2 - what a minute, that's not 1.10! I better try some other values - I guess this isn't so obvious after all!'
Right. I know how to get to a right answer but didn't understand Tordmor's expression.
http://psychcentral.com/news/2011/09/21/cognitive-style-tends-to-predict-religious-conviction/29646.html
I think this is the source but I can't be sure:
http://www.apa.org/pubs/journals/releases/xge-ofp-shenhav.pdf
http://lesswrong.com/lw/7o4/atheism_autism_spectrum/4vbc
Reddit /r/psychology discussion