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: 78-28
    Solution:
    78-28 = 50
    Column vertical calculation:

			7	8
➖			2	8
			5	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 92-51
    Solution:
    92-51 = 41
    Column vertical calculation:

			9	2
➖			5	1
			4	1

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 65-5
    Solution:
    65-5 = 60
    Column vertical calculation:

			6	5
➖				5
			6	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 36-5
    Solution:
    36-5 = 31
    Column vertical calculation:

			3	6
➖				5
			3	1

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 68-7
    Solution:
    68-7 = 61
    Column vertical calculation:

			6	8
➖				7
			6	1

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 75-12
    Solution:
    75-12 = 63
    Column vertical calculation:

			7	5
➖			1	2
			6	3

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 95-80
    Solution:
    95-80 = 15
    Column vertical calculation:

			9	5
➖			8	0
			1	5

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>>注：本次最多计算 7 道题。

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