Texas Instruments TI-82 STATS - Using ¹ and Ì

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Using ¹ and Ì
Many calculators (including the TI-82 STATS) make a distinction
between the symbols for subtraction and negation.
Use ¹ to enter subtraction operations. Use Ì to enter a negative
number in an operation, in an expression, or on a setup screen.
Example: Subtract 10 from 25.
Press Result
2 5 ¹ 1 0
Í
Example: Add 10 to L25.
Press Result
Ì 2 5 Ã 1 0
Í