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# Calculations Using RPN and the Stack

Reverse Polish Notation (RPN) can be used to perform operations (+, -, *, /, ...) on the x and y registers.

See The Automatic Stack on how to use the stack with RPN.

## Examples of Math Operations in RPN Calculation Mode

To Press (display) Display X
Add 6+4 6 ENTER 4+ 10.00
Subtract 6-4 6 ENTER 4- 2.00
Multiply 6×4 6 ENTER 4× 24.00
Divide 6÷4 6 ENTER 4÷ 1.5
Power 31.25 3 ENTER 1.25 y^x 3.95
Find percent with percent add-on: 498+7% 498 ENTER 7%
+
34.86
532.86
Find percent with percent discount: 69.99-10% 69.99 ENTER 10%
-
7.00
62.99
Find percent: 4% of \$453 453 ENTER 4% 18.12
Find percent ratio: 14 to 25 (% of total) 25 ENTER 14 %T 56.00
Control order: 7 × (3 + 5) 3 ENTER 5 + 7 × 56.00
Square Root √15.5 15.5√ 3.94
Add to the last result 3.94+2 2+ 5.94
Use EE for large numbers 100000÷2 EE5 ENTER 2÷ 50,000.00
Find reciprocal: 1/3.2 3.2 1/x 0.31
Entering a fraction: 3 5/8
The fraction value will be displayed in the current number format. The second press of the decimal point begins the entry of the denominator.
3.5.8
ENTER
3 5/8
3.625

Tap the "←" key to delete the last number entered. "C" clears the pending entry.

Use the SWAP key to swap the x and y values.

Use the ROLL key to roll the values of the stack.