User Manual

94 APPENDIX - Reference Information
Accuracy Information
The calculator stores results internally as 13-digit numbers but displays
them rounded to 10 digits or fewer, depending on the decimal format.
The internal digits, or guard digits, increase the calculator’s accuracy.
Additional calculations use the internal value, not the value displayed.
Rounding
If a calculation produces a result with 11-digits or more, the calculator
uses the internal guard digits to determine how to display the result. If
the eleventh digit of the result is 5 or greater, the calculator rounds the
result to the next larger value for display.
For example, consider this problem.
1 P 3 Q 3 = ?
Internally, the calculator solves the problem in two steps, as shown
below.
1. 1 P 3 = 0.3333333333333
2. 0.3333333333333 Q 3 = 0.9999999999999
The calculator rounds the result and displays it as 1. This rounding
enables the calculator to display the most accurate result.
Although most calculations are accurate to within ±1 in the last displayed
digit, higher-order mathematical functions use iterative calculations, in
which inaccuracies can accumulate in the guard digits. In most cases, the
cumulative error from these calculations is maintained beyond the 10-
digit display so that no inaccuracy is shown.
Error 8
Canceled
iterative
calculation
• TVM worksheet: $ was pressed to stop the
evaluation of
I/Y.
• Amortization worksheet: $ was pressed to
stop the evaluation of
BAL or INT.
• Cash Flow worksheet: $ was pressed to stop
the evaluation of
IRR.
• Bond worksheet: $ was pressed to stop the
evaluation of
YLD.
• Depreciation worksheet: $ was pressed to stop
the evaluation of
DEP or RDV.
Error Possible Causes