Which shows the correct word and expanded forms for the decimal?
9.057
a.
nine and fifty-seven thousandths
9 + 0.05 + 0.007
b.
nine and fifty-seven thousandths
9 + 0.5 + 0.07
c.
nine and fifty-seven hundredths
9 + 0.05 + 0.007
d.
nine and fifty-seven hundredths
9 + 0.5 + 0.07

Try and remember your place values!

An easy way is that smaller numbers, have larger names (im sure there are other ways!)

0.1  - tenths  (like how one place value after 1 is tens)
0.01 - hundredths (2 place values after 1 is hundred)
etc.

Also remember that 10 of one place value will be 1 of the next up.
 
In your case the answer is A.