• # question_answer Estimate each of the following products by rounding off each number of nearest tens: (a) $87\times 32$ (b) $311\times 113$ (c) $3239\times 28$ (d) $1385\times 789$

 (a) We have, $87\times 32$ Rounded off 87 to nearest tens = 90 and rounded off 32 to nearest tens = 30 So, estimated product$=90\times 30=2700$. (b) We have, $311\times 113$ Rounded of 311 to nearest tens = 310 and rounded off 113 of nearest tens =110 So, estimated product $=310\times 110=34100$. (c) We have, $3239\times 28$ Rounded off 3239 to nearest tens = 3240 and rounded off 28 to nearest tens = 30 So, estimated product $=3240\times 30=97200$, (d) We have, $1385\times 789$ Rounded off 1385 to nearest tens = 1390 and rounded off 789 to nearest tens = 790. So, estimated product $=1390\times 790$ $=1,098,100$