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: 20-9
    Solution:
    20-9 = 11
    Column vertical calculation:

			1
			2	0
➖				9
			1	1

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 80-6
    Solution:
    80-6 = 74
    Column vertical calculation:

			1
			8	0
➖				6
			7	4

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 85-58
    Solution:
    85-58 = 27
    Column vertical calculation:

			1
			8	5
➖			5	8
			2	7

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-29
    Solution:
    78-29 = 49
    Column vertical calculation:

			1
			7	8
➖			2	9
			4	9

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 80-69
    Solution:
    80-69 = 11
    Column vertical calculation:

			1
			8	0
➖			6	9
			1	1

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 82-3
    Solution:
    82-3 = 79
    Column vertical calculation:

			1
			8	2
➖				3
			7	9

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 72-41
    Solution:
    72-41 = 31
    Column vertical calculation:

			7	2
➖			4	1
			3	1

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>>注：本次最多计算 7 道题。

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