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<aura:component> <aura:attribute name="myNumber" type="integer" default="10"/> <ui:inputNumber label="Enter a number: " value="{!v.myNumber}" updateOn="keyup"/> <br/> <ui:outputNumber value="{!v.myNumber +v.myNumber }"/> </aura:component>
If you want to do addition, do it in JavaScript controller and refer in the component.