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: 99-25
    Solution:
    99-25 = 74
    Column vertical calculation:

			9	9
➖			2	5
			7	4

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 39-26
    Solution:
    39-26 = 13
    Column vertical calculation:

			3	9
➖			2	6
			1	3

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 81-59
    Solution:
    81-59 = 22
    Column vertical calculation:

			1
			8	1
➖			5	9
			2	2

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 23-15
    Solution:
    23-15 = 8
    Column vertical calculation:

			1
			2	3
➖			1	5
			0	8

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 46-11
    Solution:
    46-11 = 35
    Column vertical calculation:

			4	6
➖			1	1
			3	5

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 54-31
    Solution:
    54-31 = 23
    Column vertical calculation:

			5	4
➖			3	1
			2	3

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 50-40
    Solution:
    50-40 = 10
    Column vertical calculation:

			5	0
➖			4	0
			1	0

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>>注：本次最多计算 7 道题。

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