CREATE TABLE table_43903 ("School name" TEXT, "address" TEXT, "students" FLOAT, "grades" TEXT, "2007 API" FLOAT)

Which grades have students smaller than 430, and a 2007 API of 510?
SELECT "grades" FROM table_43903 WHERE "students" < '430' AND "2007 API" = '510'
SELECT "grades" FROM "table_43903" WHERE "2007 API" = '510' AND "students" < '430'