It can go either way.
Yes, in-home does need a hyphen. It's two words put together to form a word for a different concept.
two thirds
Two-thirds
Not necessary,but the hyphen signifies relationship between the two words,thus emphasizing the inner value.
2/3 is in its simplest form.
0.13168724279
Since you're changing it into a superlative, you're definitely going to use two separate words, so no hyphen is necessary.
No it doesn't require a hyphen.
It Is A Special Hyphen
Two thirds.Two thirds.Two thirds.Two thirds.
the answer to nine and two thirds and five and two thirds is 4
Non-breaking hyphen