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: 45+27
    Solution:
    45+27 = 72
    Column vertical calculation:

			4	5
➕			21	7
			7	2

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 86-59
    Solution:
    86-59 = 27
    Column vertical calculation:

			1
			8	6
➖			5	9
			2	7

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 85+14
    Solution:
    85+14 = 99
    Column vertical calculation:

			8	5
➕			1	4
			9	9

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 84+10
    Solution:
    84+10 = 94
    Column vertical calculation:

			8	4
➕			1	0
			9	4

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 89-55
    Solution:
    89-55 = 34
    Column vertical calculation:

			8	9
➖			5	5
			3	4

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 83-40
    Solution:
    83-40 = 43
    Column vertical calculation:

			8	3
➖			4	0
			4	3

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 68+17
    Solution:
    68+17 = 85
    Column vertical calculation:

			6	8
➕			11	7
			8	5

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>>注：本次最多计算 7 道题。

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