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Started by: raymyjamie (6857)
All good.
I did that mental arithmatic one several times & kept gerrin' wrong answer. If you look at the individual numbers they add up to 4100. Something happens to the brain near the end. In your head is 4090 & you add 10, your brain says 4900 plus 10 - unbelievable
Replied: 25th Jun 2013 at 18:27