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: 77+18
    Solution:
    77+18 = 95
    Column vertical calculation:

			7	7
➕			11	8
			9	5

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 97-66
    Solution:
    97-66 = 31
    Column vertical calculation:

			9	7
➖			6	6
			3	1

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 77-49
    Solution:
    77-49 = 28
    Column vertical calculation:

			1
			7	7
➖			4	9
			2	8

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 95-21
    Solution:
    95-21 = 74
    Column vertical calculation:

			9	5
➖			2	1
			7	4

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 93-71
    Solution:
    93-71 = 22
    Column vertical calculation:

			9	3
➖			7	1
			2	2

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 75+17
    Solution:
    75+17 = 92
    Column vertical calculation:

			7	5
➕			11	7
			9	2

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 40+21
    Solution:
    40+21 = 61
    Column vertical calculation:

			4	0
➕			2	1
			6	1

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>>注：本次最多计算 7 道题。

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