Excel formula reference another worksheet

I am using Excel 2010 and came across a spreadsheet with formulas that was created by someone else.   In Sheet2 there is a formula that references a value in Sheet1 Cell A2 (see below):
My question is the use of the plus + in this case, I haven't seen this being used before in an Excel formula so I am not sure of when it is required or the purpose, etc.   Thanks for any info.
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barry houdiniCommented:
Using + is something that was used in old Lotus123 spreadsheets, it works in Excel but it isn't required, you can use just


regards, barry

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fjkaykr11Author Commented:
thanks, that's what I figured but I wasn't sure
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