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: 620+90
    Solution:
    620+90 = 710
    Column vertical calculation:

			6	2	0
➕			1	9	0
			7	1	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 200-80
    Solution:
    200-80 = 120
    Column vertical calculation:

			1
			2	0	0
➖				8	0
			1	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 280+400
    Solution:
    280+400 = 680
    Column vertical calculation:

			2	8	0
➕			4	0	0
			6	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 720+800
    Solution:
    720+800 = 1520
    Column vertical calculation:

			7	2	0
➕		1	8	0	0
		1	5	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 260-60
    Solution:
    260-60 = 200
    Column vertical calculation:

			2	6	0
➖				6	0
			2	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 490-300
    Solution:
    490-300 = 190
    Column vertical calculation:

			4	9	0
➖			3	0	0
			1	9	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 520+900
    Solution:
    520+900 = 1420
    Column vertical calculation:

			5	2	0
➕		1	9	0	0
		1	4	2	0

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>>注：本次最多计算 7 道题。

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