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: 65+23
    Solution:
    65+23 = 88
    Column vertical calculation:

			6	5
➕			2	3
			8	8

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 81-55
    Solution:
    81-55 = 26
    Column vertical calculation:

			1
			8	1
➖			5	5
			2	6

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 88-69
    Solution:
    88-69 = 19
    Column vertical calculation:

			1
			8	8
➖			6	9
			1	9

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 64+15
    Solution:
    64+15 = 79
    Column vertical calculation:

			6	4
➕			1	5
			7	9

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 85-43
    Solution:
    85-43 = 42
    Column vertical calculation:

			8	5
➖			4	3
			4	2

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 47+17
    Solution:
    47+17 = 64
    Column vertical calculation:

			4	7
➕			11	7
			6	4

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 84-52
    Solution:
    84-52 = 32
    Column vertical calculation:

			8	4
➖			5	2
			3	2

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>>注：本次最多计算 7 道题。

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