Which of the following aspects should be emphasized while framing a learning model for a child's learning of mathematics? (a) Understanding the learner's prior knowledge (b) Knowing the processes through which children construct mathematical ideas (c) Memorizing formulas and procedures (d) Understanding the structure and nature of mathematics

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?