Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 16+34
    Solution:
    16+34 = 50
    Column vertical calculation:

			1	6
➕			31	4
			5	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 87-40
    Solution:
    87-40 = 47
    Column vertical calculation:

			8	7
➖			4	0
			4	7

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 44-37
    Solution:
    44-37 = 7
    Column vertical calculation:

			1
			4	4
➖			3	7
			0	7

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 60-33
    Solution:
    60-33 = 27
    Column vertical calculation:

			1
			6	0
➖			3	3
			2	7

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 67-12
    Solution:
    67-12 = 55
    Column vertical calculation:

			6	7
➖			1	2
			5	5

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 66-13
    Solution:
    66-13 = 53
    Column vertical calculation:

			6	6
➖			1	3
			5	3

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 54+11
    Solution:
    54+11 = 65
    Column vertical calculation:

			5	4
➕			1	1
			6	5

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>>注：本次最多计算 7 道题。

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