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: 87-69
    Solution:
    87-69 = 18
    Column vertical calculation:

			1
			8	7
➖			6	9
			1	8

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 81-54
    Solution:
    81-54 = 27
    Column vertical calculation:

			1
			8	1
➖			5	4
			2	7

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 91-45
    Solution:
    91-45 = 46
    Column vertical calculation:

			1
			9	1
➖			4	5
			4	6

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 31-19
    Solution:
    31-19 = 12
    Column vertical calculation:

			1
			3	1
➖			1	9
			1	2

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 98-74
    Solution:
    98-74 = 24
    Column vertical calculation:

			9	8
➖			7	4
			2	4

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 64-33
    Solution:
    64-33 = 31
    Column vertical calculation:

			6	4
➖			3	3
			3	1

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 89-52
    Solution:
    89-52 = 37
    Column vertical calculation:

			8	9
➖			5	2
			3	7

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>>注：本次最多计算 7 道题。

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