How can mathematics learning in primary school be facilitated? Scientists have developed an intervention to promote the learning of math in school. Named ACE-ArithmEcole, the program is designed to help schoolchildren surpass their intuitions and rely instead on the use of arithmetic principles. More than half (50.5%) of the students who took part in the intervention were able to solve difficult problems, as compared to 29.8% for pupils who followed the standard course of study.