This is the 9587th most frequent Portuguese word.
continha
"Continha" means "small account" or "small calculation" in English.
Here, 'continha' is the third-person singular imperfect form of the verb 'conter' in Portuguese, meaning 'contained'.
Eu fazia uma conta simples e ela continha apenas números pequenos.
I was doing a simple calculation, and it contained only small numbers.
In this case, 'continha' is a diminutive form of 'conta', meaning 'small calculation' or 'little math problem'.
Minha irmã me pediu para ajudá-la com a continha de matemática.
My sister asked me to help her with the little math problem.
Here, 'continha' as a diminutive of 'conta' refers to a small or embellished mark used for decoration.