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: 419+489
    Solution:
    419+489 = 908
    Column vertical calculation:

			4	1	9
➕			41	81	9
			9	0	8

[2/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 811+296
    Solution:
    811+296 = 1107
    Column vertical calculation:

			8	1	1
➕		1	21	9	6
		1	1	0	7

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 230+177
    Solution:
    230+177 = 407
    Column vertical calculation:

			2	3	0
➕			11	7	7
			4	0	7

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 275+421
    Solution:
    275+421 = 696
    Column vertical calculation:

			2	7	5
➕			4	2	1
			6	9	6

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 395+246
    Solution:
    395+246 = 641
    Column vertical calculation:

			3	9	5
➕			21	41	6
			6	4	1

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 487+435
    Solution:
    487+435 = 922
    Column vertical calculation:

			4	8	7
➕			41	31	5
			9	2	2

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 391+589
    Solution:
    391+589 = 980
    Column vertical calculation:

			3	9	1
➕			51	81	9
			9	8	0

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>>注：本次最多计算 7 道题。

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