question_answer 19)

                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) We have, 578 x 161 578 \[\to \] 600                 [rounding off to nearest hundreds] 161 \[\to \] 200 [rounding off to nearest hundreds] \[\therefore \] Estimated product = 600 x 200 = 1,20,000 (b) We have, 5281 x 3491 5281 \[\to \] 5000             [rounding off to nearest thousands] 3491 \[\to \] 3500                             [rounding off to nearest hundreds] \[\therefore \] Estimated product = 5000 x 3500 = 1,75,00,000 (c) We have, 1291 x 592 1291\[\to \] 1300              [rounding off to nearest hundreds] 592\[\to \] 600                  [rounding off to nearest hundreds] \[\therefore \] Estimated product = 1300 x 600 = 7,80,000 (d) We have, 9250 x 29 9250\[\to \]9000               [rounding off to nearest thousands] 29 \[\to \]30              [rounding off to nearest tens] \[\therefore \] Estimated product = 9000 x 30 = 2,70,000