No, that's 1/12
10/24 or ten twenty-fourths is simplified by dividing out a two from the denominator and numerator, this simplifies to 5/12 or five twelfths.
3 and 3 fourths
11/2
1/2
two fourths
1/2
one half
2 and 2/4 is 2 and 1/2 in its simplest form
1/2
There are many - two thirds is its simplest form, but there's eight twelfths, sixteen twenty fourths etc. But you can't get simpler than two thirds.
4 1/2 is the simplest form.
Forty two fifty sixths in its simplest form is twenty one twenty eighths.