According to the sources I can find "learnt" is the English and "learned" the American version http://www.grammar-monster.com/easily_confused/learned_learnt.htm

According to the sources I can find "learnt" is the English and "learned" the American version http://www.grammar-monster.com/easily_confused/learned_learnt.htm http://www.grammar-monster.com/easily_confused/learned_learn...