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Question

Estimate the product of 4.5 x 5.4

A
15
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B
20
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C
25
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D
30
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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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