actividades de medidas de peso

do these exercises to review weights and measures and the multiplication table:


http://www.ceipjuanherreraalcausa.es/Recursosdidacticos/CUARTO/datos/01_Mates/datos/05_rdi/U09/unidad09.htm

http://concurso.cnice.mec.es/cnice2006/material077/oca/portada_content.html