The utility I use the most on my iPhone is the calculator. I use it often to reconcile my checkbook, calculate discounts in the store, and more. but when I use the iPhone's calculator to add up a list of numbers, it doesn't offer a record of what I input, so I don't know if I made an error tapping numbers in.
Enter Siri..... I can activate her and say "85 plus 25.5 plus 941.12 plus 6 plus 168.96," and she will go to Wolfram Alpha for the answer. The bonus is Siri shows a record of what l said, so I can check it. And if I made a mistake, all I do is press tap to edit (under the formula) and correct it and it calculates again. I don't have to do it all over again like I would in Calculator. Very slick!
[Updated to add: Unfortunately, this tip will only work in English, since Wolfram Alpha is not capable of understanding any other languages yet.]
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