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: 700+500
    Solution:
    700+500 = 1200
    Column vertical calculation:

			7	0	0
➕		1	5	0	0
		1	2	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 720-200
    Solution:
    720-200 = 520
    Column vertical calculation:

			7	2	0
➖			2	0	0
			5	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 780-400
    Solution:
    780-400 = 380
    Column vertical calculation:

			7	8	0
➖			4	0	0
			3	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 380+500
    Solution:
    380+500 = 880
    Column vertical calculation:

			3	8	0
➕			5	0	0
			8	8	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 760+300
    Solution:
    760+300 = 1060
    Column vertical calculation:

			7	6	0
➕		1	3	0	0
		1	0	6	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 500+600
    Solution:
    500+600 = 1100
    Column vertical calculation:

			5	0	0
➕		1	6	0	0
		1	1	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 600-400
    Solution:
    600-400 = 200
    Column vertical calculation:

			6	0	0
➖			4	0	0
			2	0	0

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>>注：本次最多计算 7 道题。

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