Estimate the product of 4.5 x 5.4

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Solution

The correct option is C 25
Round off each factor to its greatest place, then multiply the rounded off factors.
4.5 ---> 5
5.4 ---> 5
4.5 x 5.4 ---> 5 x 5 = 25

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A number 5.4 is wrongly entered as 4.5 due to typing error. Find the percentage error.

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