Question 200840
Very  good  question.
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Decimal  to  fraction
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.5 = 5/10  =  1/2  
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.25 = 25 /100 = 1/4
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.375 = 375 / 1000 = 3/8 ,,,,,,,(  divided  by  125) 
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To  generalize,  set  decimal  number  over  place  value
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Fraction  to  decimal
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Remember  that  1/2  means  "1 divided  by  2" =  .5
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1/4 =  1 divided  by 4 =  .25
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3/8 =  3  divided  by  8 = .375
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also  mixed  numbers,  either  change  to  improper  fraction  and  proceed  as  above,  or  just  do  fraction  part  and  add  back  in  whole  number  part.