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: 88-10
    Solution:
    88-10 = 78
    Column vertical calculation:

			8	8
➖			1	0
			7	8

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 84-9
    Solution:
    84-9 = 75
    Column vertical calculation:

			1
			8	4
➖				9
			7	5

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 82-0
    Solution:
    82-0 = 82
    Column vertical calculation:

			8	2
➖				0
			8	2

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 68-7
    Solution:
    68-7 = 61
    Column vertical calculation:

			6	8
➖				7
			6	1

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 39+12
    Solution:
    39+12 = 51
    Column vertical calculation:

			3	9
➕			11	2
			5	1

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 19-13
    Solution:
    19-13 = 6
    Column vertical calculation:

			1	9
➖			1	3
			0	6

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 47-47
    Solution:
    47-47 = 0
    Column vertical calculation:

			4	7
➖			4	7
			0	0

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>>注：本次最多计算 7 道题。

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