Question

Give a rough estimate (by rounding off to nearest hundred) And a closer estimate (by rounding off to nearest tens)
1. 439+334+4,317
2. 1,08,7,34-47,599​

Answer 1

Answer:

(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.

Answer 2

Answer:

1. Nearest hundred = 5000

Nearest tens = 5090

2. Nearest hundred = 61100

Nearest tens = 61130

Explanation:

1. Nearest hundred

439 => 400

334 => 300

4317 => 4300 (+)

5000

Nearest ten

439 => 440

334 => 330

4317 => 4320 (+)

5090

2. Nearest hundred

108734 => 108700

47599 => 47600 (-)

61100

Nearest ten

108734 => 108730

47599 => 47600 (-)

61130