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round off to the nearest ten

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asked Jan 13, 2014 in Addition by Miriam Mendoza
   

1 Answer

+3 votes
How to do it? Change the "ones" column to 0. Change the "tens" column depending on whether the "ones" column was more or less than 5. Numbers in "hundreds", "thousand" columns, etc, stay the same.

As in:  10 rounds to 10          11 rounds to 10          12 rounds to 10          13 rounds to 10          14 rounds to 10

            15 rounds to 20          16 rounds to 20          17 rounds to 20         18 rounds to 20         19 rounds to 20

           111 rounds to 110        but       115 rounds to 120
answered Jan 13, 2014 by DeepDark Inquisitive Expert (6,610 points)

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