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: 44-16
    Solution:
    44-16 = 28
    Column vertical calculation:

			1
			4	4
➖			1	6
			2	8

[2/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 26-10
    Solution:
    26-10 = 16
    Column vertical calculation:

			2	6
➖			1	0
			1	6

[3/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 87-64
    Solution:
    87-64 = 23
    Column vertical calculation:

			8	7
➖			6	4
			2	3

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