MyTeachingPartner-Math/Science pre-kindergarten curricula and teacher supports: Associations with children's mathematics and science learning

•We tested the effects of a system of two pre-k curricula in mathematics and science, with children from low-income families.•Schools were random assigned into one of two intervention groups or a control group.•Intervention groups: curricula only or curricula plus teacher support system.•Children in classrooms of teachers exposed to the curricula and teacher support system evidenced increased gains in some math skills.