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: 47+40
    Solution:
    47+40 = 87
    Column vertical calculation:

			4	7
➕			4	0
			8	7

[2/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 58+31
    Solution:
    58+31 = 89
    Column vertical calculation:

			5	8
➕			3	1
			8	9

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 41+27
    Solution:
    41+27 = 68
    Column vertical calculation:

			4	1
➕			2	7
			6	8

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 61-53
    Solution:
    61-53 = 8
    Column vertical calculation:

			1
			6	1
➖			5	3
			0	8

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 73-42
    Solution:
    73-42 = 31
    Column vertical calculation:

			7	3
➖			4	2
			3	1

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 30+16
    Solution:
    30+16 = 46
    Column vertical calculation:

			3	0
➕			1	6
			4	6

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 36+27
    Solution:
    36+27 = 63
    Column vertical calculation:

			3	6
➕			21	7
			6	3

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>>注：本次最多计算 7 道题。

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