Previous studies in both typically and atypically developing children have shown that
approximate number system (ANS) abilities predict formal mathematical knowledge later
on in life. The current study investigated whether playing specially designed training games
that targets the ANS system using nonsymbolic stimuli only would improve preschool
children\u2019s ANS abilities. Thirty-eight preschool children were randomly allocated to either
the training or control group. For 5 weeks, 20 preschoolers (9 girls) in the training group
played daily games for 10 min that included guessing and comparing numerosities, whereas
18 control children (6 girls) were involved in interactive picture book reading sessions.
Children\u2019s ANS abilities were assessed using a computerized task before and after the
training program. An analysis of covariance with posttraining ANS scores as dependent
variable and pretraining scores as a covariate showed that the children in the training group
had higher ANS abilities after the training, in contrast to children in the control group. This study provides evidence that ANS abilities can be improved in
preschool children through a daily training program that targets the ANS specifically. These
findings provide support for further training programs for preschool children who show
mathematical difficulties early on in life