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: 87-79
    Solution:
    87-79 = 8
    Column vertical calculation:

			1
			8	7
➖			7	9
			0	8

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 98-21
    Solution:
    98-21 = 77
    Column vertical calculation:

			9	8
➖			2	1
			7	7

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 65-38
    Solution:
    65-38 = 27
    Column vertical calculation:

			1
			6	5
➖			3	8
			2	7

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 98-66
    Solution:
    98-66 = 32
    Column vertical calculation:

			9	8
➖			6	6
			3	2

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 82-58
    Solution:
    82-58 = 24
    Column vertical calculation:

			1
			8	2
➖			5	8
			2	4

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 42+36
    Solution:
    42+36 = 78
    Column vertical calculation:

			4	2
➕			3	6
			7	8

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 93-43
    Solution:
    93-43 = 50
    Column vertical calculation:

			9	3
➖			4	3
			5	0

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>>注：本次最多计算 7 道题。

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