Engaging students in mathematical activities at the primary level can help in which of the following ways? (a) Providing opportunities to children to explore many abstract concepts and learn computational strategies (b) Helping to utilize free periods given in the time-table (c) Helping students deepen their mathematical understanding and reasoning (d) Serving as a tool for summative assessment Choose the correct option:

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?