Find The Odd One Out And For What Reason.

[Ninnynanny]

Bewildered by the last few.
1. One, Two, Five, Six, Ten.

2. Cuboid, Tetrahedron, Cube, Icosahedron, Dodecahedron.

3. 1/4, 1/2, 1, 3, 5.

4. King Edward, King James 1, King George V, Duchess of Hamilton, Duchess of Montrose.

Thank you for any help.

[weecalf]

Five got 4 letters ?

[aelmpvw]

4 i'm not aware of a ship named after king james 1

[factor-fiction]

1. One- it's the only square number. Actually there are several possible answers

[factor-fiction]

3. In old money there was no 5d piece

[jno]

and in new money no 6p

[jno]

ah, that was an answer to 1

[factor-fiction]

1. One is the only one starting with a vowel.
I think the 6p coin answer is probably right but the question is weak

[jno]

I hate odd one out questions, there are usually more answers than items. "Five" is the only one with the letter I... you could go on all week.

[Fibonacci]

2 Cuboid - not a Platonic solid (ie all faces not identical)