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: 87-81
    Solution:
    87-81 = 6
    Column vertical calculation:

			8	7
➖			8	1
			0	6

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 98-23
    Solution:
    98-23 = 75
    Column vertical calculation:

			9	8
➖			2	3
			7	5

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 65-40
    Solution:
    65-40 = 25
    Column vertical calculation:

			6	5
➖			4	0
			2	5

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 98-68
    Solution:
    98-68 = 30
    Column vertical calculation:

			9	8
➖			6	8
			3	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 82-60
    Solution:
    82-60 = 22
    Column vertical calculation:

			8	2
➖			6	0
			2	2

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 42+38
    Solution:
    42+38 = 80
    Column vertical calculation:

			4	2
➕			31	8
			8	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 93-45
    Solution:
    93-45 = 48
    Column vertical calculation:

			1
			9	3
➖			4	5
			4	8

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>>注：本次最多计算 7 道题。

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