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: 19-12
    Solution:
    19-12 = 7
    Column vertical calculation:

			1	9
➖			1	2
			0	7

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 68-25
    Solution:
    68-25 = 43
    Column vertical calculation:

			6	8
➖			2	5
			4	3

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 88-70
    Solution:
    88-70 = 18
    Column vertical calculation:

			8	8
➖			7	0
			1	8

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 34+16
    Solution:
    34+16 = 50
    Column vertical calculation:

			3	4
➕			11	6
			5	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 69+5
    Solution:
    69+5 = 74
    Column vertical calculation:

			6	9
➕			1	5
			7	4

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 66-25
    Solution:
    66-25 = 41
    Column vertical calculation:

			6	6
➖			2	5
			4	1

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 29+17
    Solution:
    29+17 = 46
    Column vertical calculation:

			2	9
➕			11	7
			4	6

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>>注：本次最多计算 7 道题。

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