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: 74-48
    Solution:
    74-48 = 26
    Column vertical calculation:

			1
			7	4
➖			4	8
			2	6

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 91-23
    Solution:
    91-23 = 68
    Column vertical calculation:

			1
			9	1
➖			2	3
			6	8

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 59+11
    Solution:
    59+11 = 70
    Column vertical calculation:

			5	9
➕			11	1
			7	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 93-18
    Solution:
    93-18 = 75
    Column vertical calculation:

			1
			9	3
➖			1	8
			7	5

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 46+14
    Solution:
    46+14 = 60
    Column vertical calculation:

			4	6
➕			11	4
			6	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 81-12
    Solution:
    81-12 = 69
    Column vertical calculation:

			1
			8	1
➖			1	2
			6	9

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 82-24
    Solution:
    82-24 = 58
    Column vertical calculation:

			1
			8	2
➖			2	4
			5	8

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>>注：本次最多计算 7 道题。

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