1.  0.04 x 0.0162 is equal to:

A. 6.48 x 10-4
B. 6.48 x 10-5
C. 6.48 x 10-6
D. 6.48 x 10-3

Answer: Option A

Explanation:

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