Maria is 8 years old and is learning to use numbers in school. most likely she is in the stage of development

concrete operational

During this stage, Maria gain a better understanding of mental operations where she develops an ability to think logically especially in numbers and make rational judgement about observable or concrete events but she have to make effort on abstract or hypothetical concepts. So, the best method to teach this child is to let her have the opportunity to ask questions and explains things back to you to allow her manipulate mental information.  

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Concrete operational APEX Verified

Explanation:

you aren't worthless, you are a one of a kind person who, deserves happiness like anyone else, you may not get it but everyone deserves happiness. i hope this .