CREATE TABLE table_435 ("Series #" FLOAT, "Season #" FLOAT, "Episode title" TEXT, "Writer ( s ) " TEXT, "Director" TEXT, "U.S. viewers  ( millions ) " TEXT, "Original air date" TEXT)

How many episodes had 9.90 million viewers?
SELECT COUNT("Episode title") FROM table_435 WHERE "U.S. viewers (millions)" = '9.90'
SELECT COUNT("Episode title") FROM "table_435" WHERE "U.S. viewers (millions)" = '9.90'