Grades 1-2 Video Solutions 2022-2022_1-2

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Video Summary

The problem involves two houses where the sum of numbers in each house is 20, and two numbers are shared between both. The task is to find the number hidden under a question mark. By equating the remaining sum of unshared numbers from both houses, which is 13 on one side, and represented as 3 plus the question mark plus 1 on the other, the equation simplifies to 4 plus the question mark equals 13. Solving for the question mark, it turns out to be 9. Therefore, the hidden number is 9, and the correct answer is option D.