One situation is when shopping for grocery items ... things will be priced using the decimal system: Tomato's, $1.59 per pound. Knowing that 1.59 is less than 1.75 could be beneficial.
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Signed numbers are used for:TemperatureMoney, Accounting, or EconomyMath Problems
Natural numbers are all the counting numbers excluding zero and all negative numbers. People use these in everyday life to count, add, subtract, and even with money purposes
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There is no specific symbol. The symbol for real numbers is R and that for rational numbers is Q so you could use R \ Q.
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