Rounding Numbers
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Rules
Of Rounding Off Data
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Rule
# 1:
If the digit to be dropped is greater than 5, then add
"1" to the last digit to be retained and drop all digits farther
to the right.
For example:
3.677 is rounded off to 3.68 if we need
three significant figures in measurement.
3.677 is rounded off to 3.7 if we need two
significant figures in measurement. |
Rule
# 2:
If
the digit to be dropped is less than 5, then simply drop it without adding
any number to the last digit.
For example:
6.632 is rounded off to 6.63 if we need
three significant figures in measurement.
6.632 is rounded off to 6.6 if we need two
significant figures in measurement.
Rule
# 3:
If the digit to be dropped is exactly 5 then:
(A) If the digit to be retained is even, then just drop
the "5".
For example:
6.65 is rounded off to 6.6 if we need two
significant figures in measurement.
3.4665 is rounded off to 6.466 if we need
four significant figures in measurement.
(B) If the digit to be retained is odd, then add "1"
to it.
For example:
6.35 is rounded off to 6.4 if we need two
significant figures in measurement.
3.4675 is rounded off to 6.468 if we need
four significant figures in measurement.
Remember:
Zero is an even number
3.05 is rounded off to 3.0
if we need two significant figures in measurement. |