(a) 439 + 334 + 4,317

Rounding off to nearest hundreds,

439 rounds off to 400

334 rounds off to 300

And 4317 rounds off to 4300,

We get,

= 400+300+4300

= 5000

By rounding off to nearest tens,

439 rounds off to 440

334 rounds off to 330

And 4317 rounds off to 4320,

We get,

= 440+330+4320

= 5090

(b) 1,08,734 – 47,599

Rounding off to nearest hundreds,

1, 08,734 rounds off to 1,08,700

47,599 rounds off to 47,600

We get,

= 1, 08,700 – 47,600

= 61100

Rounding off to nearest tens,

1, 08,734 rounds off to 1, 08,730

47,599 rounds off to 47,600

We get,

= 1, 08,730 – 47,600

= 61130

(c) 8325 – 491

Rounding off to nearest hundreds,

8325 rounds off to 8300

491 rounds off to 500

We get,

= 8300 - 500

= 7800

Rounding off to nearest tens,

8325 rounds off to 8330

491 rounds off to 490

We get,

= 8330 – 490

= 7840

(d) 4,89,348 – 48,365

Rounding off to nearest hundreds,

4,89,348 rounds off to 4,89,300

48,365 rounds off to 48,400

We get,

= 489300 – 48400

= 440900

Rounding off to nearest tens,

4,89,348 rounds off to 4,89,350

48,365 rounds off to 48,370

We get,

= 489350 – 48370

= 440980