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: 16+14
    Solution:
    16+14 = 30
    Column vertical calculation:

			1	6
➕			11	4
			3	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 87-60
    Solution:
    87-60 = 27
    Column vertical calculation:

			8	7
➖			6	0
			2	7

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 44-17
    Solution:
    44-17 = 27
    Column vertical calculation:

			1
			4	4
➖			1	7
			2	7

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 60-53
    Solution:
    60-53 = 7
    Column vertical calculation:

			1
			6	0
➖			5	3
			0	7

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 67-32
    Solution:
    67-32 = 35
    Column vertical calculation:

			6	7
➖			3	2
			3	5

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 66-33
    Solution:
    66-33 = 33
    Column vertical calculation:

			6	6
➖			3	3
			3	3

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 54-21
    Solution:
    54-21 = 33
    Column vertical calculation:

			5	4
➖			2	1
			3	3

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>>注：本次最多计算 7 道题。

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