About: http://webisa.webdatacommons.org/50192710

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	As problem types there are addition, subtraction, multiplication, division, square a number and root extraction in up to seven difficulty levels selectable.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com