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: 88-20
    Solution:
    88-20 = 68
    Column vertical calculation:

			8	8
➖			2	0
			6	8

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 84-19
    Solution:
    84-19 = 65
    Column vertical calculation:

			1
			8	4
➖			1	9
			6	5

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 82-10
    Solution:
    82-10 = 72
    Column vertical calculation:

			8	2
➖			1	0
			7	2

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 68-17
    Solution:
    68-17 = 51
    Column vertical calculation:

			6	8
➖			1	7
			5	1

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 39+11
    Solution:
    39+11 = 50
    Column vertical calculation:

			3	9
➕			11	1
			5	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 19-12
    Solution:
    19-12 = 7
    Column vertical calculation:

			1	9
➖			1	2
			0	7

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 40-17
    Solution:
    40-17 = 23
    Column vertical calculation:

			1
			4	0
➖			1	7
			2	3

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>>注：本次最多计算 7 道题。

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