Question

The population of a town was 78787 in the year 1991 and 95833 in the year 2001. Estimate the increase in population by rounding off each population to nearest hundreds.

Answer 1

Hint:
Here we will first round off the population of the town in the given first year to its nearest hundreds. Then we will round off the population of the town in the second year to its nearest hundreds. We will then find the difference between the two populations to get the required increase in population.

Complete step by step solution:
Here we need to find the increase in population by rounding off to its nearest 100.
It is given that the population of a town in the year 1991 is equal to 78787.
So, we will first round it off to the nearest hundreds.
We know that 78800 is closer to the number 78787. So the nearest hundreds to the number 78787 is equal to 78800.
It is given that the population of a town in the year 2001 is equal to 95833.
So, we will first round it off to the nearest hundreds.
We know that 95800 is closer to the number 95833. So the nearest hundreds to the number 95833 is equal to 95800.
Now, we will find the increase in the population by finding the difference between the population in 1991 and the population in 2001.
Increase in population \[ = 95800 - 78800 = 17000\].

Therefore, the required population is equal to 17000.

Note:
When we round off a number to the nearest hundred, we always look at the tens digit of the number. If that digit is 0, 1, 2, 3, or 4, then we will round it off to the previous hundred. If that digit is 5, 6, 7, 8, or 9, then we will round it off to the next hundred. Here, we can make a mistake by adding the number of people to find an increase in population. To find increase in any dimension we always find the difference between the dimensions.