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: 440+500
    Solution:
    440+500 = 940
    Column vertical calculation:

			4	4	0
➕			5	0	0
			9	4	0

[2/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 240+400
    Solution:
    240+400 = 640
    Column vertical calculation:

			2	4	0
➕			4	0	0
			6	4	0

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 340+400
    Solution:
    340+400 = 740
    Column vertical calculation:

			3	4	0
➕			4	0	0
			7	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 840-500
    Solution:
    840-500 = 340
    Column vertical calculation:

			8	4	0
➖			5	0	0
			3	4	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 740-400
    Solution:
    740-400 = 340
    Column vertical calculation:

			7	4	0
➖			4	0	0
			3	4	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 740-300
    Solution:
    740-300 = 440
    Column vertical calculation:

			7	4	0
➖			3	0	0
			4	4	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 160+300
    Solution:
    160+300 = 460
    Column vertical calculation:

			1	6	0
➕			3	0	0
			4	6	0

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>>注：本次最多计算 7 道题。

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