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: 250+470
    Solution:
    250+470 = 720
    Column vertical calculation:

			2	5	0
➕			41	7	0
			7	2	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 520-120
    Solution:
    520-120 = 400
    Column vertical calculation:

			5	2	0
➖			1	2	0
			4	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 880-210
    Solution:
    880-210 = 670
    Column vertical calculation:

			8	8	0
➖			2	1	0
			6	7	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 620+220
    Solution:
    620+220 = 840
    Column vertical calculation:

			6	2	0
➕			2	2	0
			8	4	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 360+310
    Solution:
    360+310 = 670
    Column vertical calculation:

			3	6	0
➕			3	1	0
			6	7	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 440+540
    Solution:
    440+540 = 980
    Column vertical calculation:

			4	4	0
➕			5	4	0
			9	8	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 880-750
    Solution:
    880-750 = 130
    Column vertical calculation:

			8	8	0
➖			7	5	0
			1	3	0

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>>注：本次最多计算 7 道题。

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