Subjects: Mathematics; Source: http://www.somatematica.com.br/softwares.php?pag=1.
Record details
Subjects: Arithmetic; Source: http://www.somatematica.com.br/softwares.php?pag=12.
Subjects: Mathematics; Source: http://www.somatematica.com.br/softwares.php?pag=6.