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: 45-14
    Solution:
    45-14 = 31
    Column vertical calculation:

			4	5
➖			1	4
			3	1

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 36-23
    Solution:
    36-23 = 13
    Column vertical calculation:

			3	6
➖			2	3
			1	3

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 88-55
    Solution:
    88-55 = 33
    Column vertical calculation:

			8	8
➖			5	5
			3	3

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-52
    Solution:
    78-52 = 26
    Column vertical calculation:

			7	8
➖			5	2
			2	6

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 46-23
    Solution:
    46-23 = 23
    Column vertical calculation:

			4	6
➖			2	3
			2	3

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 49-45
    Solution:
    49-45 = 4
    Column vertical calculation:

			4	9
➖			4	5
			0	4

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 37-24
    Solution:
    37-24 = 13
    Column vertical calculation:

			3	7
➖			2	4
			1	3

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>>注：本次最多计算 7 道题。

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