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: 89-72
    Solution:
    89-72 = 17
    Column vertical calculation:

			8	9
➖			7	2
			1	7

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 87-96
    Solution:
    87-96 = - (96 - 87) = - 9
    Column vertical calculation:

			1
			9	6
➖			8	7
			0	9

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 91-65
    Solution:
    91-65 = 26
    Column vertical calculation:

			1
			9	1
➖			6	5
			2	6

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-32
    Solution:
    78-32 = 46
    Column vertical calculation:

			7	8
➖			3	2
			4	6

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 86-2
    Solution:
    86-2 = 84
    Column vertical calculation:

			8	6
➖				2
			8	4

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 98-40
    Solution:
    98-40 = 58
    Column vertical calculation:

			9	8
➖			4	0
			5	8

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 88-10
    Solution:
    88-10 = 78
    Column vertical calculation:

			8	8
➖			1	0
			7	8

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>>注：本次最多计算 7 道题。

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