Hello Donald,

Thank you for your feedback.

The reason why the NumericTextBox component behaves in this way is that it accepts a valid number as input.

A percentage is a dimensionless number (pure number) and it has no unit of measurement. It is a number or ratio expressed as a fraction of 100. That is why displaying 20% requires the user to enter a valid number - e.g. 0.2.

To show the value entered itself as the percentage value i.e. prevent the multiplication by 100, create a custom format string, e.g.:

<kendo-numerictextbox
      format="#.##\\%"
      [value]="value"
    ></kendo-numerictextbox>

Here is an example:

https://stackblitz.com/edit/angular-cslw6y-255hhe

For more details check this document:

https://github.com/telerik/kendo-intl/blob/master/docs/num-formatting/index.md#custom

Regards,
Martin
Progress Telerik