ABBA had over 20 number one hits around the world. The question is too broad to answer accurately.
ABBA has had a lot of hit songs, but their most known is Dancing Queen.
ABBA scored only one number one hit in North America, that being Dancing Queen that went to the top of the American charts. ABBA had no number one's in Canada.
ABBA
ABBA had numerous number one hits all around the world. The question is too broad.
ABBA's second #1 hit was 'I Do, I Do, I Do, I Do, I do', topping the charts in Australia and New Zealand.
1970s
I believe that ABBA's last really big hit was The Winner Takes It All.
I believe it was Super Trouper in 1980. But ABBA Gold has been on the top of the charts as a re-release and it continues to outsell world-wide.
In 1980, ABBA's 'The Winner Takes it All' was #1 in the UK, Ireland and the Netherlands. Later, 'Super Trouper' was #1 in the above, plus Germany.
Their biggest hit around that time was I Have A Dream.
1974.