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: 61-47
    Solution:
    61-47 = 14
    Column vertical calculation:

			1
			6	1
➖			4	7
			1	4

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 98-53
    Solution:
    98-53 = 45
    Column vertical calculation:

			9	8
➖			5	3
			4	5

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 29+15
    Solution:
    29+15 = 44
    Column vertical calculation:

			2	9
➕			11	5
			4	4

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 45+13
    Solution:
    45+13 = 58
    Column vertical calculation:

			4	5
➕			1	3
			5	8

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 13+30
    Solution:
    13+30 = 43
    Column vertical calculation:

			1	3
➕			3	0
			4	3

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 34+30
    Solution:
    34+30 = 64
    Column vertical calculation:

			3	4
➕			3	0
			6	4

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 68+10
    Solution:
    68+10 = 78
    Column vertical calculation:

			6	8
➕			1	0
			7	8

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>>注：本次最多计算 7 道题。

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