If a column is bound to a filed of type "number", this has to be specified in the DataSource schema. This will enable the respective filter options for that type: "is grater than", "is less than", etc.
For example we have the "Freight" field:
<column field="Freight" title="Freight">
The DataSource schema configuration:
<datasource type="DataSourceTagHelperType.Ajax" page-size="20">
<read url="@Url.Action("Orders_Read", "Grid")" />
<field name="Freight" type="number"></field>
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