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: 29+13
    Solution:
    29+13 = 42
    Column vertical calculation:

			2	9
➕			11	3
			4	2

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 91-70
    Solution:
    91-70 = 21
    Column vertical calculation:

			9	1
➖			7	0
			2	1

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 97-80
    Solution:
    97-80 = 17
    Column vertical calculation:

			9	7
➖			8	0
			1	7

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 94-15
    Solution:
    94-15 = 79
    Column vertical calculation:

			1
			9	4
➖			1	5
			7	9

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-44
    Solution:
    99-44 = 55
    Column vertical calculation:

			9	9
➖			4	4
			5	5

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 55-55
    Solution:
    55-55 = 0
    Column vertical calculation:

			5	5
➖			5	5
			0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 63-39
    Solution:
    63-39 = 24
    Column vertical calculation:

			1
			6	3
➖			3	9
			2	4

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>>注：本次最多计算 7 道题。

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