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: 550+370
    Solution:
    550+370 = 920
    Column vertical calculation:

			5	5	0
➕			31	7	0
			9	2	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 720-400
    Solution:
    720-400 = 320
    Column vertical calculation:

			7	2	0
➖			4	0	0
			3	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 190-120
    Solution:
    190-120 = 70
    Column vertical calculation:

			1	9	0
➖			1	2	0
			0	7	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 800-420
    Solution:
    800-420 = 380
    Column vertical calculation:

			1
			8	0	0
➖			4	2	0
			3	8	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 440-220
    Solution:
    440-220 = 220
    Column vertical calculation:

			4	4	0
➖			2	2	0
			2	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 300+620
    Solution:
    300+620 = 920
    Column vertical calculation:

			3	0	0
➕			6	2	0
			9	2	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 800-520
    Solution:
    800-520 = 280
    Column vertical calculation:

			1
			8	0	0
➖			5	2	0
			2	8	0

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>>注：本次最多计算 7 道题。

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