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: 70+23
    Solution:
    70+23 = 93
    Column vertical calculation:

			7	0
➕			2	3
			9	3

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 86-55
    Solution:
    86-55 = 31
    Column vertical calculation:

			8	6
➖			5	5
			3	1

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 93-69
    Solution:
    93-69 = 24
    Column vertical calculation:

			1
			9	3
➖			6	9
			2	4

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 69+15
    Solution:
    69+15 = 84
    Column vertical calculation:

			6	9
➕			11	5
			8	4

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 90-43
    Solution:
    90-43 = 47
    Column vertical calculation:

			1
			9	0
➖			4	3
			4	7

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 52+17
    Solution:
    52+17 = 69
    Column vertical calculation:

			5	2
➕			1	7
			6	9

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 89-52
    Solution:
    89-52 = 37
    Column vertical calculation:

			8	9
➖			5	2
			3	7

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>>注：本次最多计算 7 道题。

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