We use numbers and math all the time. Shopping, studying, socializing, numbers and math are in every aspect of daily life. For children – those who are just learning numbers and math – how do they understand these abstract concepts? Language, parents, and culture may play an important role in children’s learning of such new concepts. We collaborate with Lab of Developmental Studies at Harvard university and Cognitive Development Lab at Chicago university to conduct cross-linguistic and cross-cultural studies. We hope to learn from the studies that how language and culture affect children’s understanding of numbers and math.