Add and subtract of this number 5+0.5 and 5-0.5

Hi,
Addition:
 5+0.5+5-0.5= 10 
subtraction:
 5+0.5-( 5-0.5)=  5+0.5-5+0.5= 1 

 

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Add will be 5.5 and Sub. Will be 4.5
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What are you looking for?