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: 65-42
    Solution:
    65-42 = 23
    Column vertical calculation:

			6	5
➖			4	2
			2	3

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 80-24
    Solution:
    80-24 = 56
    Column vertical calculation:

			1
			8	0
➖			2	4
			5	6

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 75-21
    Solution:
    75-21 = 54
    Column vertical calculation:

			7	5
➖			2	1
			5	4

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 87-73
    Solution:
    87-73 = 14
    Column vertical calculation:

			8	7
➖			7	3
			1	4

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 86-94
    Solution:
    86-94 = - (94 - 86) = - 8
    Column vertical calculation:

			1
			9	4
➖			8	6
			0	8

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 66-31
    Solution:
    66-31 = 35
    Column vertical calculation:

			6	6
➖			3	1
			3	5

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 56-21
    Solution:
    56-21 = 35
    Column vertical calculation:

			5	6
➖			2	1
			3	5

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>>注：本次最多计算 7 道题。

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