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Not really sure what you mean, but if you're looking for tips to aid mental arithmetic, ways to deal with awkward numbers include breaking them down into factors, rounding up or down then dealing with the remainder, and so on.

Eg: 47 + 83. You could say 80 = 40 = 120, then + 7 = 127, finally +3 = 130.

Many people become adept at particular lines of arithmetical enquiry by constant use. For example, good darts players are adept at rapid addition, subtraction and factorising of real integers. Some bar staff can handle the price of quite complicated rounds of drinks even under pressure of trade & noise.

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Q: What are some ways to to remember subtracting real numbers?
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