rule-of-three-and-three-quarters

Updated: May 11, 2025

It is quite a simple sum, as you see: You could do it in a minute because you have been to a good school and have taken pains with your lessons; but it was quite otherwise with poor Nigel. He sat down to work out his sum with a piece of chalk on a smooth stone. He tried it by practice and the unitary method, by multiplication, and by rule-of-three-and-three-quarters.

E. (Edith) Nesbit - The Book of Dragons