About: http://webisa.webdatacommons.org/11432010

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Directress should introduce the numbers 11 to 19 in sets of three, i.e. 11-13 and when the child is familiar with 11-13, then she should be introduced to 13-15, 15-17, and 17-19.
http://www.w3.org/ns/prov#wasQuotedFrom	montessoriequipment.com