En una tienda hay 100 helados, y se venden 45 en un día. ¿Cuántos helados quedan?
Descripción didáctica: Este reto matemático, aparentemente sencillo, sirve para introducir a los alumnos de primaria (primer ciclo) en la operación de resta. Se presenta un contexto real y atractivo (helados) para facilitar la comprensión del problema. La pregunta
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