Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 75+23
    Solution:
    75+23 = 98
    Column vertical calculation:

			7	5
➕			2	3
			9	8

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 91-55
    Solution:
    91-55 = 36
    Column vertical calculation:

			1
			9	1
➖			5	5
			3	6

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 98-69
    Solution:
    98-69 = 29
    Column vertical calculation:

			1
			9	8
➖			6	9
			2	9

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 74+15
    Solution:
    74+15 = 89
    Column vertical calculation:

			7	4
➕			1	5
			8	9

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 95-43
    Solution:
    95-43 = 52
    Column vertical calculation:

			9	5
➖			4	3
			5	2

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 57+17
    Solution:
    57+17 = 74
    Column vertical calculation:

			5	7
➕			11	7
			7	4

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 94-52
    Solution:
    94-52 = 42
    Column vertical calculation:

			9	4
➖			5	2
			4	2

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>>注：本次最多计算 7 道题。

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