Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate (by rounding off to nearest tens): (a) 439 + 334 +4317 (b) 1,08,737 47,599 (c) 8325 491 (d) 4,89,348 48,365

We have to round off the numbers to its nearest hundred and tens an then add it and find the sum.

(a) 439 + 334 +4317

Rounding off to hundreds

Rounding off 439 to the nearest hundreds= 400

Rounding off 334 to the nearest hundreds=300

Rounding off 4,317 to the nearest hundreds, we get 4,300

On adding we get,

400 + 300 + 4,300 = 5,000

Rounding off to tens

Rounding off 439 to the nearest tens = 440

Rounding off 334 to the nearest tens= 330

And, rounding off 4,317 to the nearest tens =4,320

On adding we get

440 + 330 + 4,320 = 5,090

  • The answer is 5,000 when we round off the given terms to the nearest hundreds.
  • The answer is 5,090 when we round off the given terms to the nearest tens.

(b) 1,08,737 47,599

Rounding off to hundreds

Rounding off 1,08,734 to the nearest hundreds= 1,08,700

And rounding off 47,599 to the nearest hundreds= 47,600

On subtracting we get

1,08,700-47,600=61,100

Rounding off to tens

Rounding off 1,08,734 to the nearest tens =1,08,730

Rounding off 47,599 to the nearest tens =47,600

On subtracting we get

1,08,730-47,600=61,130

  • The answer is 61,000 when we round off the given terms to the nearest hundreds.
  • The answer is 61,130 when we round off the given terms to the nearest tens.

(c) 8325 – 491

Rounding off to hundreds

Rounding off 8,325 to the nearest hundreds=  8,300

And, rounding off 491 to the nearest hundreds=  500

On subtracting we get

8,300-500=7,800

Rounding off to tens

Rounding off 8,325 to the nearest tens= 8,330

And, rounding off 491 to the nearest tens= 490

On subtracting we get,

8,330-490=7,840

The answer is 7800 when we round off the given terms to the nearest hundreds.
The answer is 7840 when we round off the given terms to the nearest tens.

(d) 4,89,348 – 48,365

Rounding off to hundreds

Rounding off 4,89,348 to the nearest hundreds= 4,89,300

And, rounding off 48,365 to the nearest hundreds=48,400

On subtracting we get

4,89,300-48,400=4,40,900

Rounding off to tens

Rounding off 4,89,348 to the nearest tens= 4,89,350

Rounding off 48,365 to the nearest tens= 48,370

On subtracting we get

4,89,350-48,370=4,40,980

  • The answer is 4,40,900 when we round off the given terms to the nearest hundreds.
  • The answer is 4,40,980 when we round off the given terms to the nearest tens.

 

 

 

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