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

[1/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 97-79
    Solution:
    97-79 = 18
    Column vertical calculation:

			1
			9	7
➖			7	9
			1	8

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 88-21
    Solution:
    88-21 = 67
    Column vertical calculation:

			8	8
➖			2	1
			6	7

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 75-38
    Solution:
    75-38 = 37
    Column vertical calculation:

			1
			7	5
➖			3	8
			3	7

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 88-66
    Solution:
    88-66 = 22
    Column vertical calculation:

			8	8
➖			6	6
			2	2

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 92-58
    Solution:
    92-58 = 34
    Column vertical calculation:

			1
			9	2
➖			5	8
			3	4

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 52+36
    Solution:
    52+36 = 88
    Column vertical calculation:

			5	2
➕			3	6
			8	8

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 83-43
    Solution:
    83-43 = 40
    Column vertical calculation:

			8	3
➖			4	3
			4	0

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>>注：本次最多计算 7 道题。

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