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:

its not just what you eat that you gain weight. some people have a high metabolism, and that meaning no matter how much you eat it it cant you gain. but there is a way, first of all do not listen to the standard junk food diet because its the wrong type of way to gain "fat" and tell her its not "fat" your trying to gain its more muscle your trying to build, so tell her   to try fiber drinks,food,bars ect. supplements and still eat in moderation. light walking, and try to not work out too much. sitting in front of a tv and relax, eat more calories not just in junk food but like meats, fruits, veggies, ect. hope this . my friend had the same problem. so this her.

ia. mver.y..sor .r..yinee..i am.ina.rush.pleas eforg.ive   meiknowiama. nas.s holei apalo.gize