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CALCULO MENTAL

(2)
Vamos a hacer un calculo mental.
Ej: 624+235. Se hace así (sumamos las C, luego las D y luego las U):
600 + 200 = 800
20 + 30 = 50
4 + 5 =9
859
POR FAVOR, NO UTILICEIS CALCULADORA.
6 de primaria Recommended age: 10 years old
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