Math Is Fun Forum

Hannibal lecter

Member

Registered: 2016-02-11

Posts: 392

how to round a fractions number

for example I saw a number 33.69375
in a book it turned into 33.70!!

how can that be done?
and what about
4.3 is it wil be 5?
or 4?
or 3.17 what it gonna be is it like 3.20?

can you please explain that how can we move these numbers

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Wisdom is a tree which grows in the heart and fruits on the tongue

Bob

Administrator

Registered: 2010-06-20

Posts: 10,640

Re: how to round a fractions number

Rounding is explained here: https://www.mathsisfun.com/rounding-numbers.html

In the example from the book 33.69375, how many digits are required?  If one decimal place is required then the '9' causes a round up so the correct answer is 33.7

If two decimal places are required then the '3' requires a round down to 70.69

If this number is an amount in $ or £ then it may be ok to round to 33.70 if the number is wanted to the nearest tenth.  33.69375 is nearer to 33.70 than to 33.60.

So many rounding answers are possible depending what is required.

Bob

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob