Q. 1795.0( 2 Votes )

Estimate each of the following products by rounding off each number to nearest tens:

(a) 87 × 32

(b) 311 × 113

(c) 3239 × 28

(d) 1385 × 789

Answer :

(a) Rounding off 87to nearest tens = 90


Rounding of 32 to nearest tens = 30


90 × 30 = 2700


(b) Rounding off 311 to nearest tens = 310


Rounding of 113 to nearest tens = 110


310 × 110 = 34100


(c) Rounding off 3239 to nearest tens = 3240


Rounding of 28 to nearest tens = 30


3240 × 30 = 97200


(d) Rounding off 1385 to nearest tens = 1390


Rounding of 789 to nearest tens = 790


1390 × 790 = 1098100


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