para compartilhar a matemática

https://www.google.com.br/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwjuj4yQkajMAhUCFpAKHX5XAGwQjRwIBw&url=http%3A%2F%2Fwww.portalescolar.net%2F2012%2F07%2Feja-matematica-atividades-exercicios_5675.html&psig=AFQjCNE40xYl9Yo8uX2ESjXdho6xMHOFAw&ust=1461616681510490