Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 970-200
    Solution:
    970-200 = 770
    Column vertical calculation:

			9	7	0
➖			2	0	0
			7	7	0

[2/7 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

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 340-100
    Solution:
    340-100 = 240
    Column vertical calculation:

			3	4	0
➖			1	0	0
			2	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 120+400
    Solution:
    120+400 = 520
    Column vertical calculation:

			1	2	0
➕			4	0	0
			5	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 260+100
    Solution:
    260+100 = 360
    Column vertical calculation:

			2	6	0
➕			1	0	0
			3	6	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 400+400
    Solution:
    400+400 = 800
    Column vertical calculation:

			4	0	0
➕			4	0	0
			8	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 900-500
    Solution:
    900-500 = 400
    Column vertical calculation:

			9	0	0
➖			5	0	0
			4	0	0

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>>注：本次最多计算 7 道题。

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