(82)
(83)
287/352
When you are asked to round off a number, you
must determine whether the additional digit
(which is to be dropped) is 5 or more.*
If
5 1/8 6 2/7 =
this additional digit is 5 or more, you must
add 1 to the last digit that will remain in
41/8 44/7 =
the answer; if this additional digit is 4 or
less, the last digit remains unchanged.
41/8 x 7/44 =
For example:
a.
.7787 (round
off
to
three
(3)
decimal
places)
Answer: .779. Since 7 is more than 4, 1
is added to 8 to make 9.
b.
.7897 (round
off
to
three
(3)
decimal
places)
Answer: .790. Since 7 is more than 4, 1
is added to 9 to make 10 and the 1 is
carried over to the next digit, 8, to make
9.
c.
.7443 (round
off
to
three
(3)
decimal
places)
Answer: .744. Since the 3 is less than 5,
the last digit, 4, will remain unchanged.
*"Rounding-Off" of decimals - remember, even
though you must work out problems to the
highest number of places any element in the
problem contains, your answer may be accurate
only to the degree of accuracy of your meter.
If your meter will measure only to one tenth
or one hundredth then your answer with five or
six figures to the right of the decimal would
not be measurable, and the answer should be
rounded off.
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