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: 96-54
    Solution:
    96-54 = 42
    Column vertical calculation:

			9	6
➖			5	4
			4	2

[2/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 19+17
    Solution:
    19+17 = 36
    Column vertical calculation:

			1	9
➕			11	7
			3	6

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 85-50
    Solution:
    85-50 = 35
    Column vertical calculation:

			8	5
➖			5	0
			3	5

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 90-54
    Solution:
    90-54 = 36
    Column vertical calculation:

			1
			9	0
➖			5	4
			3	6

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-44
    Solution:
    99-44 = 55
    Column vertical calculation:

			9	9
➖			4	4
			5	5

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 93-49
    Solution:
    93-49 = 44
    Column vertical calculation:

			1
			9	3
➖			4	9
			4	4

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 58+22
    Solution:
    58+22 = 80
    Column vertical calculation:

			5	8
➕			21	2
			8	0

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>>注：本次最多计算 7 道题。

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