इस समस्या पर विचार कीजिए: 'कंचे के एक खेल में, रेनू ने 4 कंचे खो दिए। अब उसके पास 7 कंचे बचे हैं। उसने कितने कंचों के साथ खेल शुरू किया था?' उपरोक्त प्रश्न किसका एक उदाहरण है?

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?