Question

Multiply the nearest tens numbers of the following : 

(i) 34 × 57 

(ii) 294 × 72 

(iii) 869 × 675

Answer 1

(i) 34 × 57 

Rounding off 34 to nearest tens = 30 

Rounding off 57 to nearest tens = 60 

Thus, 30 × 60 = 1,800 

(ii) 294 x 72 

Rounding off 294 to nearest tens = 290 

Rounding off 72 to nearest tens = 70 

Thus, 290 × 70 = 20,300 

(iii) 869 × 675 

Rounding off 869 to nearest tens = 870 

Rounding off 675 to nearest tens = 680 

Thus, 870 × 680 = 5,91,600