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Calculator that thinks only if you do too (qamacalculator.com)
7 points by kumarm on July 27, 2012 | past | 1 comment
QAMA: calculator that shows correct answer only when supplied an estimate. (qamacalculator.com)
1 point by stevewilhelm on April 18, 2012 | past
A calculator that only shows the answer after you give a suitable estimate (qamacalculator.com)
144 points by ColinWright on April 17, 2012 | past | 53 comments

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