please check my answers

Question

1.Write each of the following as a common fraction or mixed number.4.0171=. 4 171/10,000
2.Arrange in order from smallest to largest.2.05,25/10 , 2.0513, 2.059,251/100 , 2.0515, 2.052, 2.051
3. 27.4 � 213.321 � 39.38 add=280.101
4.45.6
� 8.75subtract =. 36.85