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Quantitative Aptitude

Last Two Digits of a Number

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Question

How to find the number of digits in $2^{9}$ multiple by $5^{7}$ ?

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Solution

$2^{9} 5^{7} = 2^{7} \times 5^{7} \times 2^{2} = (2^{7} \times 5^{7}) \times 2^{2} = (10^{7}) \times 2^{2} = 4 \times 10^{7} = 40000000$

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