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+390
    Solution:
    550+390 = 940
    Column vertical calculation:

			5	5	0
➕			31	9	0
			9	4	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 720-420
    Solution:
    720-420 = 300
    Column vertical calculation:

			7	2	0
➖			4	2	0
			3	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 190-100
    Solution:
    190-100 = 90
    Column vertical calculation:

			1	9	0
➖			1	0	0
			0	9	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 800-400
    Solution:
    800-400 = 400
    Column vertical calculation:

			8	0	0
➖			4	0	0
			4	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 440-200
    Solution:
    440-200 = 240
    Column vertical calculation:

			4	4	0
➖			2	0	0
			2	4	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 300+600
    Solution:
    300+600 = 900
    Column vertical calculation:

			3	0	0
➕			6	0	0
			9	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 800-500
    Solution:
    800-500 = 300
    Column vertical calculation:

			8	0	0
➖			5	0	0
			3	0	0

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>>注：本次最多计算 7 道题。

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