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South America has a total land area of 17997182 square kilometers. If we round it off this value to the nearest one lakh, we get

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South America has a total land area of 17997182 square kilometers. If we round it off this value to the nearest one lakh, we get

Dear Shreya,

There are quick tricks to solve this question, but I would explain here using fundamentals of rounding-off.

Purpose of rounding off a number to x is to be able to write the number in terms of x without using decimal.

For rounding a number to nearest x (which is lakh in this case), we need to think of a number line with unit x.

For this case number line would look like this,

----------|----------|----------|----------|----------|
         178        179        180        181
(178, 179 ... are in lakhs)

Now lets find the place for 179.97182 lakh on this line (remember we want to get rid of decimals).

----------|----------|----------|----------|----------|
         178        179       * 180       181

Place for 17.997182 lakh is approximately shown as * on the line.

Here you could see that this number is closer to 180 lakh, so rounded-off number will be 180 lakhs (18000000).

 

regards,

ExamHelp

You just have to write in a simpler way Like 180000 or 180 thousand

goog


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