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: 500+590
    Solution:
    500+590 = 1090
    Column vertical calculation:

			5	0	0
➕		1	5	9	0
		1	0	9	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 520-290
    Solution:
    520-290 = 230
    Column vertical calculation:

			1
			5	2	0
➖			2	9	0
			2	3	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 580-490
    Solution:
    580-490 = 90
    Column vertical calculation:

			1
			5	8	0
➖			4	9	0
			0	9	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 1280+590
    Solution:
    1280+590 = 1870
    Column vertical calculation:

			1	2	8	0
➕				51	9	0
			1	8	7	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 560+390
    Solution:
    560+390 = 950
    Column vertical calculation:

			5	6	0
➕			31	9	0
			9	5	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 300+690
    Solution:
    300+690 = 990
    Column vertical calculation:

			3	0	0
➕			6	9	0
			9	9	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 800-490
    Solution:
    800-490 = 310
    Column vertical calculation:

			1
			8	0	0
➖			4	9	0
			3	1	0

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>>注：本次最多计算 7 道题。

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