Incorrect spelling, explanation: this form is incorrect, because the word five used to be unvoiced, and it used to be fif. However, due to pronunciation f became voiced (as it ends the word we needed a stronger sound) and was transformed to v (f and v are the same sound but the former is unvoiced). In fifteen, however, t is also unvoiced, so f must have remained unvoiced as well. Therefore fiveteen is incorrect and the correct form is fifteen.

Correct spelling, explanation: fifteen is the correct spelling of this number, because of the fact, that right after the second consonant f there is another unvoiced consonant t. Since v and f are the same sound – one voiced and another unvoiced – v became unvoiced for pronunciation reasons. Therefore fifteen is the correct form and fiveteen is incorrect.

Definition of fifteen:
numeral, cardinal number between fourteen and sixteen
– How much is this book? -It’s fifteen dollars.
Mr. and Mrs. Jonas have got fifteen children, that’s crazy.

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling