In geometrical progression, so that if 50 infants in their fi

[Anderson Dunton]

Ethod of grouping the figures soon becomes easy and reduces the labor of
addition about one-half, while those somewhat expert may group three or
more figures, still more reducing the time and labor, and sometimes two
or more columns may be added at once, by ready reckoners. Another method
is to group into tens when it can be conveniently done, and still
another method in adding up long columns is to add from the bottom to
the 
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