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In ArcMap, attempting to insert numbers into an attribute table is not allowed. Instead, a generic error such as the following is returned,"This number field can only have 2 digits to the left of the point."
This occurs due to the difference between the precision and scale of either a float or double type field with the input value.
Precision and scale of a field describe the precision and the maximum size of data which can be stored in a field. The precision describes the number of digits which can be stored in a field while scale describes the number of decimal places for double and float fields.
Create a new field in the feature class table using the Add Field geoprocessing tool, and specify the precision and scale of the new field.
1. Open ArcMap and navigate to ArcCatalog > Toolboxes > System Toolboxes > Data Management Tools > Fields > Add Field.
2. Fill in the parameters of the new field, specify the precision and scale of the field, and click OK.
For further explanation on the precision and scale of the fields, refer to the following ArcGIS Help document, ArcGIS field data types.