Can someone help me round off each of the following to 2 decimal places?

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1 Answer
Jun 5, 2017

See explanation.

Explanation:

The general rule of rounding numbers is:

You look at the digit next to the one yiou are rounding up to. If it is #4# or less you leave the rounded digit unchanged, otherwise if it is #5# or more you increaase the rounded digit by #1#.

In the given numbers you get:

  • #3.14color(red)(6)#

The number right to the 2nd decimal place is #6# (here marked in red). It is #5# or more so you have to increase the digit before the marked one, so you get:

#3.146~~3.15#

  • #1.05color(red)(4)#

The number right to the 2nd decimal place is #4# (here marked in red). It is less than #5#, so no digits before it are changed, so you get:

#1.054~~1.05#

  • #12.30color(red)(7)~~12.31#

  • #27.09color(red)(1)~~27.09#