Take any number, then divide it by 2 (in other words, halve the number). If the result is whole, add a 0 at the end. If it is not, ignore the remainder and add a 5 at the end. It works everytime.detailed explanations are provided. these are neat for sure. but it still takes less effort to grab a calculator.
also from lifehacker today, you can hack into a 6 volt battery and find 32 AA batteries. awesome!
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