Do you find it annoying when you have to add a few figures up on a calculator, then have to write down that number so you can deduct it from another figure? Why don't they have a "deduct from" key? So you can add 2+6+5+3 = 16 "deduct from" 50 = 34. so much quicker and easier than having to remember the number you need, or having to write it down.
(the above is an example only. I don't really need a calculator to do such a simple sum - honest!!!!)
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