Rounding

The decimal point can be entered automatically by setting the slider bar, entered manually in any position, or created by calculation.  When you use the slider bar to set the precision, or directly enter the decimal point, you know exactly what that number is and where the decimal will be.  But when the number is created by calculation, it may contain more numbers to the right of the decimal point than you have room to display or the slider is set to.  In that case, TenKey Tutor rounds the number to fit the appropriate space.

There are two kinds of rounding commonly found with electronic calculators; 5/4 and cut.

• Cut just eliminates extra digits after a designated position to the right of the decimal point.  For example, if the slider is set to 2 and the result is 79.46831, the "cut" happens after the 6, and the display will read 79.46.

• In 5/4 rounding, the first digit being cut off is looked at.  If it is 5 or above, the number is rounded up; if it is 4 or below, it rounds down.  In the case above, the result would be 79.47.

TenKey Tutor uses the 5/4 rounding method when it rounds for numeric displays in the data entry window, the paper tape output, and the tool tip displays.