Overview: 3 questions will be solved this time.Among them
           ☆3 integer calculations

[1/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 79-23
    Solution:
    79-23 = 56
    Column vertical calculation:

			7	9
➖			2	3
			5	6

[2/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 87-35
    Solution:
    87-35 = 52
    Column vertical calculation:

			8	7
➖			3	5
			5	2

[3/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 94-20
    Solution:
    94-20 = 74
    Column vertical calculation:

			9	4
➖			2	0
			7	4

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