30.15
418.0015
fifteen twentieths:= 15/20= 15 ÷ 20= 0.75 in decimal
To write 3.15 in word form, you would write "three and fifteen hundredths." This breaks down the decimal number into its whole number part (3) and its decimal part (15 hundredths). Using the word "and" to separate the whole number from the decimal part is a common convention in English.
0.15 and 0.20 I think the intention of the question would be how to write 15 20/100, which would be 15.20.
0.0050
5/10000 = 0.0005
30.15
14.015
0.0001
418.0015
350.015
fifteen twentieths:= 15/20= 15 ÷ 20= 0.75 in decimal
1.88
0.15
0.15
15000.