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: 91-87
    Solution:
    91-87 = 4
    Column vertical calculation:

			1
			9	1
➖			8	7
			0	4

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 100-73
    Solution:
    100-73 = 27
    Column vertical calculation:

			1	1
			1	0	0
➖				7	3
			0	2	7

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 84-49
    Solution:
    84-49 = 35
    Column vertical calculation:

			1
			8	4
➖			4	9
			3	5

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 90-45
    Solution:
    90-45 = 45
    Column vertical calculation:

			1
			9	0
➖			4	5
			4	5

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 68+25
    Solution:
    68+25 = 93
    Column vertical calculation:

			6	8
➕			21	5
			9	3

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 69+4
    Solution:
    69+4 = 73
    Column vertical calculation:

			6	9
➕			1	4
			7	3

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 92-17
    Solution:
    92-17 = 75
    Column vertical calculation:

			1
			9	2
➖			1	7
			7	5

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>>注：本次最多计算 7 道题。

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