what is the {determination method} for {developing country} has {number of out of school children} as {3.23e+08} ?
What is the method for determining which developing country has 3.23e+08 children out of school?
SELECT ?value WHERE { wd:Q177323 p:P2573 ?s . ?s ps:P2573 ?x filter(contains(?x,'3.23e+08')) . ?s pq:P459 ?value}
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q177323> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2573> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <3.23e+08> .
?statement <http://www.wikidata.org/entity/P459> ?value. 
} 

Which method is used to figure out, out of school kids numbering 3.23e+08 in developing countries  ?