Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 34+13
    Solution:
    34+13 = 47
    Column vertical calculation:

			3	4
➕			1	3
			4	7

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 96-70
    Solution:
    96-70 = 26
    Column vertical calculation:

			9	6
➖			7	0
			2	6

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 92-80
    Solution:
    92-80 = 12
    Column vertical calculation:

			9	2
➖			8	0
			1	2

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-15
    Solution:
    99-15 = 84
    Column vertical calculation:

			9	9
➖			1	5
			8	4

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 94-44
    Solution:
    94-44 = 50
    Column vertical calculation:

			9	4
➖			4	4
			5	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 60-55
    Solution:
    60-55 = 5
    Column vertical calculation:

			1
			6	0
➖			5	5
			0	5

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 68-39
    Solution:
    68-39 = 29
    Column vertical calculation:

			1
			6	8
➖			3	9
			2	9

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>>注：本次最多计算 7 道题。

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