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100 - ? = Seguim amb les estratègia per a la resta. Estratègies senzilles però molt útils per millorar la nostra agilitat al càlcul mental: - Parelles del 100. Per completar: 100 - 15 = 15 + 5 + 80...
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Descomposem i fem restes parcials. EXEMPLE: 83 - 37 = 83 - 30 - 3 - 4 = 46
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La resta com a inversa de la suma (Parelles del 10): 10 - 6 = 4 perquè 6 + 4 = 10 Restes parcials: 15 - 9 = 15 - 5 - 4 = 6