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  Spanish: Matemáticas - Unidad de problemas de aritmética (elementaria)
Spanish: Matemáticas - Unidad de problemas de aritmética (elementaria) - preview 1
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Unidad de aritmética con el tema de "la playa" y usando conchas marinas para practicar. Incluye varias actividades. Arithmetic unit centered on the theme "the beach" using seashells to practice. It includes several activities.
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