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) \[1385\times 789\] |
Answer:
(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 \[=1390\times 790\] \[=1,098,100\]
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