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: 86-54
    Solution:
    86-54 = 32
    Column vertical calculation:

			8	6
➖			5	4
			3	2

[2/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 29+17
    Solution:
    29+17 = 46
    Column vertical calculation:

			2	9
➕			11	7
			4	6

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 95-50
    Solution:
    95-50 = 45
    Column vertical calculation:

			9	5
➖			5	0
			4	5

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 80-54
    Solution:
    80-54 = 26
    Column vertical calculation:

			1
			8	0
➖			5	4
			2	6

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 89-44
    Solution:
    89-44 = 45
    Column vertical calculation:

			8	9
➖			4	4
			4	5

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 83-49
    Solution:
    83-49 = 34
    Column vertical calculation:

			1
			8	3
➖			4	9
			3	4

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 68+22
    Solution:
    68+22 = 90
    Column vertical calculation:

			6	8
➕			21	2
			9	0

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>>注：本次最多计算 7 道题。

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