About: http://webisa.webdatacommons.org/24925580

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	To be able to add them, the person needs to be able to hold three units, that is, the two numbers plus the arithmetic operation to be applied, such as addition or subtraction.
http://www.w3.org/ns/prov#wasQuotedFrom	wikipedia.org