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: 10-7
    Solution:
    10-7 = 3
    Column vertical calculation:

			1
			1	0
➖				7
			0	3

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 70-4
    Solution:
    70-4 = 66
    Column vertical calculation:

			1
			7	0
➖				4
			6	6

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 75-56
    Solution:
    75-56 = 19
    Column vertical calculation:

			1
			7	5
➖			5	6
			1	9

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 68-27
    Solution:
    68-27 = 41
    Column vertical calculation:

			6	8
➖			2	7
			4	1

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 70-67
    Solution:
    70-67 = 3
    Column vertical calculation:

			1
			7	0
➖			6	7
			0	3

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 72-1
    Solution:
    72-1 = 71
    Column vertical calculation:

			7	2
➖				1
			7	1

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 62-39
    Solution:
    62-39 = 23
    Column vertical calculation:

			1
			6	2
➖			3	9
			2	3

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>>注：本次最多计算 7 道题。

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