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: 99-72
    Solution:
    99-72 = 27
    Column vertical calculation:

			9	9
➖			7	2
			2	7

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 97-96
    Solution:
    97-96 = 1
    Column vertical calculation:

			9	7
➖			9	6
			0	1

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 81-65
    Solution:
    81-65 = 16
    Column vertical calculation:

			1
			8	1
➖			6	5
			1	6

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 68-32
    Solution:
    68-32 = 36
    Column vertical calculation:

			6	8
➖			3	2
			3	6

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 96-2
    Solution:
    96-2 = 94
    Column vertical calculation:

			9	6
➖				2
			9	4

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 88-40
    Solution:
    88-40 = 48
    Column vertical calculation:

			8	8
➖			4	0
			4	8

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-10
    Solution:
    78-10 = 68
    Column vertical calculation:

			7	8
➖			1	0
			6	8

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>>注：本次最多计算 7 道题。

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