Now of course you might be wondering when could you ever possibly need to write out number in full? Use words in the following situations:

1. When spelling out the names of numbers, those numbers less than one hundred are always hyphenated. Note that there is no hyphen between the 'hundreds' and the 'tens'.

   25% twenty-five percent 133 € One hundred and thirty-three euros

2. Numbers from one to ten except when used with numbers above ten. It is common academic practice to use digits for numbers above ll, except those that begin a sentence.

   The beginning of April finds all five ‘classical’ planets, those planets easily visible with the naked eye since ancient times, shining in the evening sky 45 minutes after sunset.

3. A number beginning a sentence.

   Thirty-five patients with chronic fatigue syndrome were followed for periods of up to eight years.

4. The shorter of two numbers used together.

   fifteen 33-cent stamps. 150 twenty-cent coins.

5. Isolated fractions or indefinite numbers in sentence.

   Nearly forty apartment owners, almost three-fourths of the residents, took part in the last building society meeting.