Question

what example we use here​

Answer 1

Answer:

In many practical calculations, only an approximation is required rather than an exact answer. To do this, numbers are rounded off to a given place value of ten, hundred, thousand ...  

 

Example on Estimating Sums:

1. There are 74 coconut cookies and 48 chocolate cookies in a jar. Estimate the total number of cookies.

Round the numbers to the nearest ten and add.

Rounded to TENS

Estimating Sums

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There are approximately 120 cookies.

The actual number of cookies is 122.

The estimate differs from the actual by 2.

2. There are 275 students in class IVth and 238 students in class Vth. Estimate the total number of students in the two classes.

We can round the numbers either to the nearest ten or the nearest hundred and add to get an estimate.

Rounded to TENS

Estimating

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There are approximately 520 students.

The estimate differs from the actual by 7.

Rounded to HUNDREDS

Rounded to HUNDREDS

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There are approximately 500 students.  

The estimate differs from the actual by 13.  

Estimating Difference:  

Example on Estimating Difference:

The school library has 284 science books and 268 social sciences books.

Estimate the difference in the number of books.

Rounded to TENS

Estimating Difference

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The difference is approximately 20 books.

The estimate differs from the actual number by 4.

Rounded to HUNDREDS

Rounded nNumbers

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In this case, rounding number to hundreds will not be meaningful as the difference will be 0.

Examples on estimating sums and differences of the numbers:

1. The number of students in Classes III, IV and V are 154,129 and 118. Estimate the total number of students in the three classes taken together.

Solution:

The rounded numbers are used to estimate.

 

So         154     ⇒     200     being more than 150

           129     ⇒     100     being less than 150

           118     ⇒     100     being less than 150

                             400     So total number as estimated is 400

[Note: Actual number is 401, which is one more than 400]

Answer: 400

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Step-by-step explanation:

Answer 2

Answer:

Hi

Step-by-step explanation:

1. The number of students in Classes III, IV and V are 154,129 and 118. ...

2.There are 216 pages in the mathematics book of Class IV and 196 pages in the English book of the same class.

These examples can be used.

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