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: 900-520
    Solution:
    900-520 = 380
    Column vertical calculation:

			1
			9	0	0
➖			5	2	0
			3	8	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 780-360
    Solution:
    780-360 = 420
    Column vertical calculation:

			7	8	0
➖			3	6	0
			4	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 840-520
    Solution:
    840-520 = 320
    Column vertical calculation:

			8	4	0
➖			5	2	0
			3	2	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 600+370
    Solution:
    600+370 = 970
    Column vertical calculation:

			6	0	0
➕			3	7	0
			9	7	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 380-160
    Solution:
    380-160 = 220
    Column vertical calculation:

			3	8	0
➖			1	6	0
			2	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 660+320
    Solution:
    660+320 = 980
    Column vertical calculation:

			6	6	0
➕			3	2	0
			9	8	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 700+320
    Solution:
    700+320 = 1020
    Column vertical calculation:

			7	0	0
➕		1	3	2	0
		1	0	2	0

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>>注：本次最多计算 7 道题。

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