In addition, the symbol + represents the operation of addition, which results in a sum, while the symbol − represents subtraction, resulting in a difference Read more to know about why do hospitals have plus sign. Discover addition and the equals symbol with this interactive article for year 2 from bbc bitesize.
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In the famous egyptian ahmes papyrus, a pair of legs walking forward marked addition, and walking away subtraction.
We show you how to use the sum formula in excel, how to use the autosum feature and how simple additions with the plus sign work.
Here is everything you need to know about plus sign in hospital and other medical symbols
