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: 39+17
    Solution:
    39+17 = 56
    Column vertical calculation:

			3	9
➕			11	7
			5	6

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 74-10
    Solution:
    74-10 = 64
    Column vertical calculation:

			7	4
➖			1	0
			6	4

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 54-30
    Solution:
    54-30 = 24
    Column vertical calculation:

			5	4
➖			3	0
			2	4

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 28+6
    Solution:
    28+6 = 34
    Column vertical calculation:

			2	8
➕			1	6
			3	4

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 45-29
    Solution:
    45-29 = 16
    Column vertical calculation:

			1
			4	5
➖			2	9
			1	6

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-58
    Solution:
    78-58 = 20
    Column vertical calculation:

			7	8
➖			5	8
			2	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 61-52
    Solution:
    61-52 = 9
    Column vertical calculation:

			1
			6	1
➖			5	2
			0	9

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>>注：本次最多计算 7 道题。

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