Rounding off decimal fractions can also be rounded off to the nearest one to one place of decimal or to two places of decimals or as is required.
(i) 32.2 can be rounded off 32
(ii) 46.8 can be rounded off 47
(iii) 188.9 can be rounded off 189
(iv) 59.1 can be rounded off 59
(v) 170.2 can be rounded off 170
Sally
bought a pair of shoes; the cost of a pair of shoes would probably read
as $ 249.95. But she paid $ 250, i.e., $ 249.95 has been rounded off to
$ 250.
Kelly bought a pair of shirts; the cost of a pair of
shirts would probably read as $ 143.22. But she paid $ 143, i.e., $
143.22 has been rounded off to $ 143.
Nearest 1
While rounding off a decimal fraction to the nearest one, if
the digit in the tenths place is < 5 then the tenths place and the
entire following place replace by 0. If the tenths place is equal to or
> 5 then the digit in the ones place is increased by 1 and all digits
after the decimal are reduced to 0.
Examples on rounding to the nearest ones:
(i) 49.37 → 49.00
We see the digit in the tenths place is 3 round to the nearest whole number which is smaller than the given decimal number. Since 3 < 5 then the decimal number is rounded to 49.00.
(ii) 96.872 → 97.00
If the digit in the tenths place is 8 round to the nearest whole number which is greater than the given decimal number. Since 8 > 5 then the decimal number is rounded to 97.00.
(iii) 67.437 → 67.000
We see the digit in the tenths place
is 4 round to the nearest whole number which is smaller than the given
decimal number. Since 4 < 5 then the decimal number is rounded to 67.000.
(iv) 9.909 → 10.000
If the digit in the tenths place is 9 round to the nearest whole number which is greater than the given decimal number. Since 9 > 5 then the decimal number is rounded to 10.000.
(v) 490.651 → 491.000
If the digit in the tenths place is 6 round to the nearest whole number which is greater than the given decimal number. Since 6 > 5 then the decimal number is rounded to 491.000.
(vi) 2492.201 → 2492.000
We see the digit in the tenths place
is 2 round to the nearest whole number which is smaller than the given
decimal number. Since 2 < 5 then the decimal number is rounded to 2492.000.
Note: Remember, to round off decimal numbers to the nearest ones (or units place), look at the digit in the tenths place.
Rounding off Decimal Fractions.
Worksheet on Rounding off number.
5th Grade Numbers Page
5th Grade Math Problems
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