I guess you mean as a fraction:
0.05 = 5/100
= 1 x 5/20 x 5
= 1/20
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0.005 = 1/200 as a fraction in its simplest terms
2 + .8 + .04 + .005
005 is thicker than 003
005 = 5
005 = 5 so the reciprocal of 005 = reciprocal of 5 = 1/5 = 0.2