1.

Estimate the following products using general rule: (a) 578 x 161 (b) 5281 x 3491 (c) 1291 x 592 (d) 9250 x 29

Answer»

(a) 578 x 161 

578 round off to 600 

161 round off to 200 

The estimated product = 600 x 200 = 1,20,000 

(b) 5281 x 3491 

5281 round of to 5,000 

3491 round off to 3,500 

The estimated product = 5,000 x 3,500 = 1,75,00,000 

(c) 1291 x 592 

1291 round off to 1300 

592 round off to 600 

The estimated product = 1300 x 600 = 7,80,000 

(d) 9250 x 29 

9250 round off to 10,000 

229 round off to 30 

The estimated product = 10,000 x 30 = 3,00,000



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