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

[1/3 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 24+24
    Solution:
    24+24 = 48
    Column vertical calculation:

			2	4
➕			2	4
			4	8

[2/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 82-21
    Solution:
    82-21 = 61
    Column vertical calculation:

			8	2
➖			2	1
			6	1

[3/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 98-48
    Solution:
    98-48 = 50
    Column vertical calculation:

			9	8
➖			4	8
			5	0

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