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Estimating Products of Numbers

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notes

Estimating products of numbers:

  • Round off each factor to its greatest place, then multiply the rounded off factors.

  • Now, estimate 81 × 479 using this rule:
    479 is rounded off to 500 (rounding off to hundreds),
    and 81 is rounded off to 80 (rounding off to tens).
    The estimated product = 500 × 80 = 40,000.

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