The formulas  need to have reference to the sheet  that you copy  them from.

If the formula reads =sum(A1:C9) and it is on Sheet1 then you need to
rewrite the formula to state =sum(Sheet1!A1:C9)... assuming you are
pasting the formula in the same cell relative to Sheet1. Pasting them
anywhere else would require your formula to be =sum(Sheet1!$A$1:$C%9)

Then copy and paste will do the trick.

Or, just link the formula from the new sheet =Sheet1!B2. And, then
use the Format Painter to copy the formatting.