CREATE TABLE table_51910 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What was the home teams score when North Melbourne played as the away team?
SELECT "Home team score" FROM table_51910 WHERE "Away team" = 'north melbourne'
SELECT "Home team score" FROM "table_51910" WHERE "Away team" = 'north melbourne'