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: 20+8
    Solution:
    20+8 = 28
    Column vertical calculation:

			2	0
➕				8
			2	8

[2/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 57+38
    Solution:
    57+38 = 95
    Column vertical calculation:

			5	7
➕			31	8
			9	5

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 56+7
    Solution:
    56+7 = 63
    Column vertical calculation:

			5	6
➕			1	7
			6	3

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 28-16
    Solution:
    28-16 = 12
    Column vertical calculation:

			2	8
➖			1	6
			1	2

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 71+24
    Solution:
    71+24 = 95
    Column vertical calculation:

			7	1
➕			2	4
			9	5

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 77-25
    Solution:
    77-25 = 52
    Column vertical calculation:

			7	7
➖			2	5
			5	2

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 89-58
    Solution:
    89-58 = 31
    Column vertical calculation:

			8	9
➖			5	8
			3	1

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>>注：本次最多计算 7 道题。

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