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: 38-14
    Solution:
    38-14 = 24
    Column vertical calculation:

			3	8
➖			1	4
			2	4

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 79-69
    Solution:
    79-69 = 10
    Column vertical calculation:

			7	9
➖			6	9
			1	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 43-15
    Solution:
    43-15 = 28
    Column vertical calculation:

			1
			4	3
➖			1	5
			2	8

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 76-9
    Solution:
    76-9 = 67
    Column vertical calculation:

			1
			7	6
➖				9
			6	7

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 68-20
    Solution:
    68-20 = 48
    Column vertical calculation:

			6	8
➖			2	0
			4	8

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 82-36
    Solution:
    82-36 = 46
    Column vertical calculation:

			1
			8	2
➖			3	6
			4	6

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 62-52
    Solution:
    62-52 = 10
    Column vertical calculation:

			6	2
➖			5	2
			1	0

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>>注：本次最多计算 7 道题。

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