Texas Instruments TI-83 PLUS - Manual (Page 24)

TI-83 Plus Operating the TI-83 Plus Silver Edition 21
Normal notation mode is the usual way we express numbers, with digits
to the left and right of the decimal, as in 12345.67 .
Sci (scientific) notation mode expresses numbers in two parts. The
significant digits display with one digit to the left of the decimal. The
appropriate power of 10 displays to the right of
E
, as in 1.234567 E 4 .
Eng (engineering) notation mode is similar to scientific notation.
However, the number can have one, two, or three digits before the
decimal; and the power-of-10 exponent is a multiple of three, as in
12.34567 E 3 .
Note: If you select Normal notation, but the answer cannot display in 10 digits
(or the absolute value is less than .001), the TI-83 Plus expresses the answer in
scientific notation.
Float, 0123456789
Float (floating) decimal mode displays up to 10 digits, plus the sign and
decimal.
0123456789 (fixed) decimal mode specifies the number of digits ( 0
through 9 ) to display to the right of the decimal. Place the cursor on the
desired number of decimal digits, and then press Í .
The decimal setting applies to Normal , Sci , and Eng notation modes.