It's not! 0.04 is ten times smaller than 0.4!
4.00 is bigger than .004 which is the same as 0.004
What is 1 10 of 004
.004 + .04 + 4 = 4.404 4.404/3 = 1.468 The average is 1.468
0.4 is 0.36 more than 0.04
.004
004 is the same as 4
.40 is bigger than .04. .40 is the same as 40/100, and .04 is the same as 4/100.
0.010000000000000002
004 is the same as 4
987 multiplied by 004 is 3,948
Probably answered by this service bulletin: TT0404-004 APR 04 Body - Whistle from Engine Area
0.04