Half a day, half a life, half a glass... Are you serious? Children, the floor is only in the rooms and in living beings. The floor is parquet, linoleum, flat, and also male and female.

Rules for words with "pol", meaning the number:

1st Sex + consistent is written without a gap: half a day, half a day, half a life, half a kilogram.

2nd Exception - half + l: half a liter, half a tablespoon, half a tape, half a lemon, half a sheet are written through the defect, because "l" and the quantity (half a liter - a bottle, not a quantity; half a liter - an adjective, not a quantity).

Three With a defiant we write if the root with the vocabulary or the own name: half-Arbuza, half-Arab, half-autumn, half-streets, half-Moscow, half-Addis Ababa, half-Muchosransk, half-Borovitska.

A funny story:

Half the first, half the second, half the third, half the fourth, half the fifth, but half the eleventh.