Ember.js change tracked variable in child component

I am new to ember.js and wanna know what's the best way to alter @tracked variable in child component.

Assume this structure:

Parent
  --- Component1

• Parent controller

  @tracked
  number = 1
  

• Parent.hbs

  <Component1 @number= />
   
  

• Component1.hbs

  <button > Add </button>
  

• Component1.js

  @tracked
  number = this.args.number
  
  @action
  addNumber(){
      this.number += 1;
      console.log(this.number)
  }
  

The number did addon in the Component1 and print the number every time I clicked the Add button, however, it didn't reflect to Parent level.