Activities/Abacus/Abacos: Difference between revisions

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=== Addition ===
=== Sumando ===


To add, simply move in more beads to represent the number you are adding. There are two rules to follow: (1) whenever you have a total of 5 units or more on the bottom of a column, cancel out the 5 by sliding the beads back down and add a five to to the top; and (2) whenever you have a total of 10 units or more in a column, cancel out the 10 and add one unit to the column immediately to the left. (With the nepohualtzintzin, you work with 20 rather than 10.)


'''Example:''' 4+3+5+19+24=55
Para sumar, simplemente agregamos cuentas para representar el número que se suma. Hay dos reglas a seguir: (1) cada vez que hay 5 unidades subidas en la parte inferior deben cancelarse bajando una cuenta de la parte superior y volviendo las inferiores a su lugar; y (2) cada vez que haya 10 unidades en una columna deben cancelarse agregando una unidad a la columna inmediatamente a la izquierda.  ( En el Nepohualtzintzin, se cancelan 20 unidades con 1 de la columna izquierda )
 
'''Ejempño:''' 4+3+5+19+24=55


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