Bruno Coudoin
(algebra_minus.xml)
Pratica a Subtracção
Responde a algumas perguntas de aritmética.
Num período de tempo limitado, conseguir indicar a diferença entre duas parcelas.
A subtraction problem with two numbers is displayed. At the right of the equals sign, give the answer, the difference. Use the left and right arrows to modify your answer and press the Enter key to check if you've got it right. If not, just try again.
