Álvarez-Estrada, E., Duque-Gómez, L., Moncada-Arboleda, S. and Quintero-Arrubla, S. 2021. THE 5 LEARNING DEVICES: A STARTING POINT FOR THE DEVELOPMENT OF LOGICAL MATHEMATICAL THINKING IN EARLY CHILDHOOD. Journal Sinergia. 9 (Jul. 2021), 73-82.