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: 67-47
    Solution:
    67-47 = 20
    Column vertical calculation:

			6	7
➖			4	7
			2	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 89-38
    Solution:
    89-38 = 51
    Column vertical calculation:

			8	9
➖			3	8
			5	1

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 61-51
    Solution:
    61-51 = 10
    Column vertical calculation:

			6	1
➖			5	1
			1	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 17-11
    Solution:
    17-11 = 6
    Column vertical calculation:

			1	7
➖			1	1
			0	6

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 95-87
    Solution:
    95-87 = 8
    Column vertical calculation:

			1
			9	5
➖			8	7
			0	8

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 74-26
    Solution:
    74-26 = 48
    Column vertical calculation:

			1
			7	4
➖			2	6
			4	8

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 52-13
    Solution:
    52-13 = 39
    Column vertical calculation:

			1
			5	2
➖			1	3
			3	9

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>>注：本次最多计算 7 道题。

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