About: http://webisa.webdatacommons.org/130728680

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	Proportional reasoning, equality vs. inequality, variables, and mathematical relationships such as diagrams and tables
http://www.w3.org/ns/prov#wasQuotedFrom	ck12.org