Question

How do you estimate the sum of 202 and 57?

Answer 1

Hint: When we use to round off numbers to help in our calculation, it is called estimation. Estimation helps to answer the question easily and quickly. In the case of two-digit numbers, we can round or estimate it to the number nearest tens place that is only one place can be estimated.

Complete step by step answer:
Here, 202 is a three-digit number and 57 is a two-digit number.
First, we estimate both these numbers i.e., 202 and 57
202 can be estimated or round off to 200 as 202 is nearest to 200, when you look in number line between 200 and 210 you will see that 202 is very much nearest to 200 and 202 is very far from 210
So, 202 is rounded off to 200
Also, 57 is round off to 60 as 57 is nearest to 60 when you look at the number line between 50 and 60 you will see that 57 is very much nearest to 60 and 50 is very far from 57
So, 57 is rounded off to 60
Now adding both the estimation $200+60=260$

Thus, an estimated sum of 202 and 57 is 260.

Additional information:
The actual sum of 202 and 57 is
$\Rightarrow 202+57=259$
And estimating or rounding off 259 is 260 approx.

Note: To estimate to the nearest 10, we see the number at units place. It is converted to 0 or 10 as proper. If the number is less than 5, it is rounded off or estimated to zero and if it is greater than 5 then it is rounded off or estimated to 10.
Keep in mind that estimation $\ne$ guess.