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: 23-14
    Solution:
    23-14 = 9
    Column vertical calculation:

			1
			2	3
➖			1	4
			0	9

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 94-69
    Solution:
    94-69 = 25
    Column vertical calculation:

			1
			9	4
➖			6	9
			2	5

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 28+15
    Solution:
    28+15 = 43
    Column vertical calculation:

			2	8
➕			11	5
			4	3

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 91-90
    Solution:
    91-90 = 1
    Column vertical calculation:

			9	1
➖			9	0
			0	1

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 53-20
    Solution:
    53-20 = 33
    Column vertical calculation:

			5	3
➖			2	0
			3	3

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 67-36
    Solution:
    67-36 = 31
    Column vertical calculation:

			6	7
➖			3	6
			3	1

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 87-72
    Solution:
    87-72 = 15
    Column vertical calculation:

			8	7
➖			7	2
			1	5

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>>注：本次最多计算 7 道题。

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