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: 30-9
    Solution:
    30-9 = 21
    Column vertical calculation:

			1
			3	0
➖				9
			2	1

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 90-6
    Solution:
    90-6 = 84
    Column vertical calculation:

			1
			9	0
➖				6
			8	4

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 95-58
    Solution:
    95-58 = 37
    Column vertical calculation:

			1
			9	5
➖			5	8
			3	7

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 88-29
    Solution:
    88-29 = 59
    Column vertical calculation:

			1
			8	8
➖			2	9
			5	9

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 90-69
    Solution:
    90-69 = 21
    Column vertical calculation:

			1
			9	0
➖			6	9
			2	1

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 92-3
    Solution:
    92-3 = 89
    Column vertical calculation:

			1
			9	2
➖				3
			8	9

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 82-41
    Solution:
    82-41 = 41
    Column vertical calculation:

			8	2
➖			4	1
			4	1

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>>注：本次最多计算 7 道题。

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