Estimate the following products: |
(a) \[87\times 313\] |
(b) \[9\times 795\] |
(c) \[898\times 785\] |
(d) \[958\times 387\] |
Make five more such problems and solve them |
Answer:
(a) \[87\times 313\] \[\because \] 87 \[\to \] 90 [Rounding off to nearest tens] 313 \[\to \] 300 [Rounding off to nearest hundred] \[\therefore \] Estimated product \[=90\times 300=27,000\] (b) \[9\times 795\] \[\because \] 9 \[\to \]10 [Rounding off to nearest tens] 795 \[\to \] 800 [Rounding off to nearest hundred] \[\therefore \] Estimated product \[=10\times 800=8,000\] (c) \[898\times 785\] \[\because \] 898 \[\to \] 900 [Rounding off to nearest tens] 785 \[\to \] 800 [Rounding off to nearest hundred] \[\therefore \] Estimated product \[=900\times 800=7,20,000\] (d) \[958\times 387\] \[\because \] 958 \[\to \] 1000 [Rounding off to nearest thousand] 387 \[\to \] 400 [Rounding off to nearest hundred] \[\therefore \] Estimated product \[=1000\times 400=4,00,000\]
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