Overview: 1 questions will be solved this time.Among them
           ☆1 integer calculations

[1/1 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 7823-42
    Solution:
    7823-42 = 7781
    Column vertical calculation:

				1
			7	8	2	3
➖					4	2
			7	7	8	1

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