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: 28-14
    Solution:
    28-14 = 14
    Column vertical calculation:

			2	8
➖			1	4
			1	4

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 89-69
    Solution:
    89-69 = 20
    Column vertical calculation:

			8	9
➖			6	9
			2	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 33-15
    Solution:
    33-15 = 18
    Column vertical calculation:

			1
			3	3
➖			1	5
			1	8

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 86-90
    Solution:
    86-90 = - (90 - 86) = - 4
    Column vertical calculation:

			1
			9	0
➖			8	6
			0	4

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 58-20
    Solution:
    58-20 = 38
    Column vertical calculation:

			5	8
➖			2	0
			3	8

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 72-36
    Solution:
    72-36 = 36
    Column vertical calculation:

			1
			7	2
➖			3	6
			3	6

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 92-72
    Solution:
    92-72 = 20
    Column vertical calculation:

			9	2
➖			7	2
			2	0

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>>注：本次最多计算 7 道题。

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