In a class VIII mathematics class, during a group activity, students measure their heights and represent them first in the form of a pictograph, then using tally marks, and finally as a histogram. The mathematical learning theories of which of the following describe this transition of students from one level to another? (A) Van Hiele (B) Zoltan P. Dienes (C) Jerome Bruner (D) Ausubel

A mathematics teacher of Class II gives the following word problem on addition to the students: 'A bag contains 4 mangoes and 6 more mangoes are put into it. How many mangoes are there in the bag in total?' This type of word problem belongs to which of the following structures of addition?

A teacher wrote the number 308 on the blackboard and asked the children to read it aloud. A child said, 'It is thirty-eight.' Which of the following is the most appropriate strategy to rectify the error made by the child?