floor – dee-ban
Written as dì băn or di ban
To remember that floor is pronounced dee-ban (di ban) in Mandarin Chinese, use the following mnemonic:
In the middle of the floor was a deer playing a banjo (dee-ban).

Tones
1. Dee (deer) is a 4th tone with \ as an accent.
Associate deer, a 4th tone, with lowering things like trip or slide down. See Tones and Mnemonics.

The deer slid down the slide.
2. Ban (banjo) is a 3rd tone with ∪ as an accent.
Associate banjo, a 3rd tone, with a horse shoe or horse or smile. See Tones and Mnemonics.

The banjo was shaped like a horse shoe.
Remember
Dee = 4th tone = \
Ban = 3rd tone = ∪