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: 400+500
    Solution:
    400+500 = 900
    Column vertical calculation:

			4	0	0
➕			5	0	0
			9	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 200+400
    Solution:
    200+400 = 600
    Column vertical calculation:

			2	0	0
➕			4	0	0
			6	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 300+400
    Solution:
    300+400 = 700
    Column vertical calculation:

			3	0	0
➕			4	0	0
			7	0	0

[4/7 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

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 700-400
    Solution:
    700-400 = 300
    Column vertical calculation:

			7	0	0
➖			4	0	0
			3	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 700-300
    Solution:
    700-300 = 400
    Column vertical calculation:

			7	0	0
➖			3	0	0
			4	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 120+300
    Solution:
    120+300 = 420
    Column vertical calculation:

			1	2	0
➕			3	0	0
			4	2	0

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>>注：本次最多计算 7 道题。

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