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Decimal Fraction - General Aptitude

Q1:

0.04 x 0.0162 is equal to:

A 6.48 x 10-3

B 6.48 x 10-4

C 6.48 x 10-5

D 6.48 x 10-6

ANS:B - 6.48 x 10-4

4 x 162 = 648. Sum of decimal places = 6.
So, 0.04 x 0.0162 = 0.000648 = 6.48 x 10-4