Explain estimation by multiplication.

Estimation by multiplication:

• The estimation of a number is a reasonable guess of the actual value.

• Estimation means approximating a quantity to the accuracy required.

• This is done by rounding off the numbers involved and getting a quick and rough answer. 

Estimation of the product:

To estimate the product, round off each factor to its greatest place, then multiply the rounded off factors.

For example,

Estimate $92 \times 57$

92 can be rounded off to the nearest ten as 90.

57 can be rounded off to the nearest ten as 60.

Hence, the estimated product $= 90 \times 60 = 5400$.

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Updated on: 10-Oct-2022

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