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: 48-31
    Solution:
    48-31 = 17
    Column vertical calculation:

			4	8
➖			3	1
			1	7

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 97-90
    Solution:
    97-90 = 7
    Column vertical calculation:

			9	7
➖			9	0
			0	7

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 74-22
    Solution:
    74-22 = 52
    Column vertical calculation:

			7	4
➖			2	2
			5	2

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 64-11
    Solution:
    64-11 = 53
    Column vertical calculation:

			6	4
➖			1	1
			5	3

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 69-49
    Solution:
    69-49 = 20
    Column vertical calculation:

			6	9
➖			4	9
			2	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 88-77
    Solution:
    88-77 = 11
    Column vertical calculation:

			8	8
➖			7	7
			1	1

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-97
    Solution:
    99-97 = 2
    Column vertical calculation:

			9	9
➖			9	7
			0	2

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>>注：本次最多计算 7 道题。

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