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+4
    Solution:
    16+4 = 20
    Column vertical calculation:

			1	6
➕			1	4
			2	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 87-50
    Solution:
    87-50 = 37
    Column vertical calculation:

			8	7
➖			5	0
			3	7

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 44-7
    Solution:
    44-7 = 37
    Column vertical calculation:

			1
			4	4
➖				7
			3	7

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 60-43
    Solution:
    60-43 = 17
    Column vertical calculation:

			1
			6	0
➖			4	3
			1	7

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 67-22
    Solution:
    67-22 = 45
    Column vertical calculation:

			6	7
➖			2	2
			4	5

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 66-23
    Solution:
    66-23 = 43
    Column vertical calculation:

			6	6
➖			2	3
			4	3

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 54-11
    Solution:
    54-11 = 43
    Column vertical calculation:

			5	4
➖			1	1
			4	3

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>>注：本次最多计算 7 道题。

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