CREATE TABLE table_name_44 (numer_of_jamaicans_granted_british_citizenship INTEGER, year VARCHAR, registration_of_a_minor_child VARCHAR)
Tell me the sum of number of jamaicans given british citizenship for 2004 and registration of a minor child more than 640
SELECT SUM(numer_of_jamaicans_granted_british_citizenship) FROM table_name_44 WHERE year = 2004 AND registration_of_a_minor_child > 640