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: 77-47
    Solution:
    77-47 = 30
    Column vertical calculation:

			7	7
➖			4	7
			3	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-38
    Solution:
    99-38 = 61
    Column vertical calculation:

			9	9
➖			3	8
			6	1

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 71-51
    Solution:
    71-51 = 20
    Column vertical calculation:

			7	1
➖			5	1
			2	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 27-11
    Solution:
    27-11 = 16
    Column vertical calculation:

			2	7
➖			1	1
			1	6

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 85-87
    Solution:
    85-87 = - (87 - 85) = - 2
    Column vertical calculation:

			8	7
➖			8	5
			0	2

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 84-26
    Solution:
    84-26 = 58
    Column vertical calculation:

			1
			8	4
➖			2	6
			5	8

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 62-13
    Solution:
    62-13 = 49
    Column vertical calculation:

			1
			6	2
➖			1	3
			4	9

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>>注：本次最多计算 7 道题。

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