Estimating to the nearest tens by rounding off

Once Ayush asked his friend Mohan to give him rupees to pay for a book.

Mohan gave him rupees.

Ayush then told him that he only needed rupees.

Mohan said that rupees is approximately equal to rupees.

Ayush got confused so, Mohan explained him about estimation to the nearest tens by rounding off.

Let’s discuss the estimation of numbers to the nearest tens by rounding off.

Let’s consider a group of numbers from to as

Here we can observe that number to are closer to in comparison with .

And, the numbers to are closer to in comparison with .

In case of estimating to nearest tens, we always look at the tens value which are nearest to the number.

We follow same concept for finding out estimated values nearest to tens.

Let us consider a digit number and we need to estimate this to the nearest tens

Here, we observe that it is nearer to so, it is rounded off to .

Now, suppose we consider a digit number and we need to estimate this number to the nearest tens by rounding off.

We can clearly observe that is nearest to . So, its estimated value will be

We see some other examples and round off them to their closer number as

Revision

Number to are closer to in comparison with so, it is rounded off to .

Number to are closer to in comparison with so, it is rounded off to .

In case of estimating to nearest tens we always look at the tens value which are nearest to the number.

Suppose we to have to estimate it to its nearest tens.

As it is nearest to ,so its estimated value will be .

The End