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: 78-48
    Solution:
    78-48 = 30
    Column vertical calculation:

			7	8
➖			4	8
			3	0

[2/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 66+30
    Solution:
    66+30 = 96
    Column vertical calculation:

			6	6
➕			3	0
			9	6

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 68-50
    Solution:
    68-50 = 18
    Column vertical calculation:

			6	8
➖			5	0
			1	8

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 86-30
    Solution:
    86-30 = 56
    Column vertical calculation:

			8	6
➖			3	0
			5	6

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 20+17
    Solution:
    20+17 = 37
    Column vertical calculation:

			2	0
➕			1	7
			3	7

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 73-49
    Solution:
    73-49 = 24
    Column vertical calculation:

			1
			7	3
➖			4	9
			2	4

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 51-28
    Solution:
    51-28 = 23
    Column vertical calculation:

			1
			5	1
➖			2	8
			2	3

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>>注：本次最多计算 7 道题。

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