Question

4. Estimate each of the following products by rounding off each factor to its greatest place :
(1) 877 × 725
(ii) 9 × 792
(ii) 87 x 221
5. Estimate the following results:
(1) 6398 + 17928
(ii) 6893 - 789
(iii) 39 x 311
(id) 968 x 539​

Answer 1

Answer:

4. (1) take 877= 900

and 725= 700

so, 900×700 = 630000

(2) take 9= 10

and 792= 800

so, 10×800= 8000

(3) take 87= 100

and 221= 200

so, 100×200= 20000

5. (1) take 6398= 6000

and 17928= 18000

so, 6000+18000= 24000

(2) take 6893= 7000

and 789= 800

so, 6200

(3) take 39= 40

and 311= 300

so, 40×300= 12000

(4) take 968= 1000

and 539= 500

so, 1000×500= 500000

Answer 2

Given :-

== 877×725 ==900

700

_______

000

000×

+ 6300××

___________

630000

___________