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gmat, first multiply as normal, then just count from tight to left the number spaces between the last digit of the number and the placement of the period to place the period:
In 7,654.321 you would have 3 spaces. In 4.3210123 you would have seven spaces.
To solve .4 x .4, first multiply: 16. Then count the number of spaces from right lo left (total is 2, one for each 4). Then you need to place he period on th product. Count from right to left the total number of spaces you counted before. Since the number is 2, you place the period 2 spaces from the right: .16
In your example:
.04*.04*.04 = 64, then you place the period six spaces to the left = .000064
Keep in mind that any number has a decimal period, although sometimes you do not need to represent it because:
2*2=4, now do the period (number of spaces to the left = 0) = 4.0