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: 57-4
    Solution:
    57-4 = 53
    Column vertical calculation:

			5	7
➖				4
			5	3

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 23-11
    Solution:
    23-11 = 12
    Column vertical calculation:

			2	3
➖			1	1
			1	2

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 52-2
    Solution:
    52-2 = 50
    Column vertical calculation:

			5	2
➖				2
			5	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 48-16
    Solution:
    48-16 = 32
    Column vertical calculation:

			4	8
➖			1	6
			3	2

[5/7 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

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 89-27
    Solution:
    89-27 = 62
    Column vertical calculation:

			8	9
➖			2	7
			6	2

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-26
    Solution:
    78-26 = 52
    Column vertical calculation:

			7	8
➖			2	6
			5	2

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>>注：本次最多计算 7 道题。

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