Clear Decimal/Integer/Currency fields By default value (0)

Hi Team,

How can we clear the value of any decimal/integer/Currency field value.

I have tried using the below given approaches for achieving this :

1. I have applied one business rule through which when the checkbox adjacent to the decimal/integer/Currency field is unchecked, the value in the decimal/integer/Currency field becomes 0.

2. setting the field value as null by code on edit page of the section

(this.set("UsrFieldName"),null);

I want the field value to be absolutely cleared out and even there should not be any 0 by default value.

Please help me find any solution to this.

Many Thanks,

Sarika