How can I subtract 500 from all cells in a given selection in Calc?

i have all these numbers: and I want to subtract 500 from each number. do I have to do this manually or can I get Calc to automate the process for me?

Just insert 500 in any empty cell. Copy this cell (Ctrl+C). Select all cells where you want subtract this value and press Ctrl+Shift+V. Select “Subtract” and “OK”. Clear temporary cell.

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Awesome, works perfectly! Thank you so much for the help!