When calculating either discount rates or the number of periods using a financial calculator, the PV and FV must have opposite signs.

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This is because PV represents the present value, which is the amount of money invested initially, while FV represents the future value, which is the amount the investment will be worth at the end of the term. If a discount rate or the number of periods are being calculated, one value must be the present value (PV) and the other value must be the future value (FV), hence they have opposite signs.

When Calculating Either Discount Rates or the Number of Periods