Question

How to do this Question a please help from the smallest to the biggest

Answer 1

To solve this type of problems, the easiest way to compare is to change them all to fractions, or to decimals, whichever is easier for you.

For the first one, change them all to decimals,
A. 525/1000=0.525
B. 3/4 = 0.750
C. 0.55 =0.550
Thus it will be obvious, whether you'd like smallest to biggest or otherwise.

For the second problem, 
A. 3.85=3.850
B. 3 5/8 = 3.625
C. 3.805 = 3.850

Choose the smallest to biggest.

Answer 2

A. turn all fractions into decimals or all decimals into fractions; I've decided to turn all fractions into decimals

525
------- = 0.525
1000

3
-- = 0.75 = 0.750 ~ (add a zero at the end to make the decimal places         4                                equal with 0.525)

0.55 = 0.55 = 0.550 ~(add a zero at the end to make the decimal places                                         equal with 0.525 and 0.750)

                                          Answer to Problem 'a':

Smallest = 0.525 = 525
                              -------
                              1000

Middle = 0.550 = 0.55

Largest = 0.750 = 3
                              --
                              4

b. turn all fractions/mixed fractions into decimals or all decimals into fractions; I've decided to turn all fractions/mixed fractions into decimals

3.805 = 3.805

3.85 = 3.850 ~ ( add a zero at the end to make the decimal places equal                                with 3.805)

3 4/5 = 80
           ----- = 0.80  =0.800 ~ (add a zero at the end to make the decimal
           100                              places equal with 3.805 and 3.850)

                                 Answers to Problem 'b':

Smallest = 0.800 = 0.80 = 3 4/5

Middle = 3.805 = 3.805

Largest = 3.850 = 3.85