How do you round 3.2 to the nearest whole number?

1 Answer
Apr 25, 2016

The result is #3#. The rule is described in the explanation.

Explanation:

To round up a number to a specified digit you look at the digit one place right of the specified digit. If it is #5# or more you add #1# to the specified digit, else you leave it unchanged. All digits right to the specified become zeros.

Examples.

  1. To round up #4.32# to the nearest whole numberyou do:

  2. look at the digit at the tenths digit #4.##color(red)(3)2#.

  3. the digit is lower than #5# so you leave the units digit (#4#) unchanged and replace all digits to the right with zeros.

  4. The result is #4.32~~4.00=4#

  5. To round up #362# to the nearest hundred you do as follows:

  6. look at the tens digit #3color(red)(6)2#

  7. the digit is higher than #5# so you add #1# to the hundreds digit.

  8. The result is #362~~400#

As the last example I will calculate the one given.

I have to round #3.2# to the nearest whole number, so I look at the first digit right to units digit (the tenths digit)

#3.##color(red)(2)#

The digit is #2# which is less than #5# do I leave the units digit (#3#) unchanged and replace all digits to the right with zeros.

So the answer is #3.2~~3.0=3#