7
4. Whole numbers and decimals
a. The
key sets the number of decimal places
together with the appropriate RED Place Value
key from the left hand side of the calculator.
The rounded result is displayed but the original
number is retained in the memory.
must be pressed each time the number is
to be rounded off.
removes the fixed decimal setting.
needs to be pressed before
is effected.
It can be applied to and individual number or
before
is pressed to complete a calculation.
eg Entering
will do the
calculation but return an answer rounded to 1 dec place.
Pressing
gives the full answer 167.832
While the
symbol is visible numbers entered will
be displayed to the pre-set number of decimal places.
eg if
has been used, then until it is cleared, any further calculations will answer
to the nearest whole number, although the actual answer will still be stored.
b. When
is used to change a fraction to a
decimal and back to a fraction, sometimes the
fraction needs to be simplified to get back to
the original.
eg 5/8 changes to 0.625 then back to 625/1000.
NB when a fraction can be simplified the symbols
d
n
D
N
will be displayed at the top of the screen
until no further simplification is possible.
This is changed back to 5/8 using the
key.
