Ms. Shreya, a primary class mathematics teacher, uses various methods to teach the addition of 2-digit numbers to her learners, such as: (i) Column addition: 2 3 + 4 6 ------6 9 (ii) Expanded form by column: 20 + 3 + 40 + 6 ----------60 + 9 = 69 (iii) Horizontal expansion: (23 + 46) = (20 + 3) + (40 + 6) = (20 + 40) + (6 + 3) = 60 + 9 = 69 Which of the following statements is most appropriate regarding her pedagogy?

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?