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: 75-60
    Solution:
    75-60 = 15
    Column vertical calculation:

			7	5
➖			6	0
			1	5

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 57-52
    Solution:
    57-52 = 5
    Column vertical calculation:

			5	7
➖			5	2
			0	5

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 29-18
    Solution:
    29-18 = 11
    Column vertical calculation:

			2	9
➖			1	8
			1	1

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 72-31
    Solution:
    72-31 = 41
    Column vertical calculation:

			7	2
➖			3	1
			4	1

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 98-67
    Solution:
    98-67 = 31
    Column vertical calculation:

			9	8
➖			6	7
			3	1

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 64-50
    Solution:
    64-50 = 14
    Column vertical calculation:

			6	4
➖			5	0
			1	4

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 79-78
    Solution:
    79-78 = 1
    Column vertical calculation:

			7	9
➖			7	8
			0	1

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>>注：本次最多计算 7 道题。

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