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: 825-332
    Solution:
    825-332 = 493
    Column vertical calculation:

			1
			8	2	5
➖			3	3	2
			4	9	3

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 898-584
    Solution:
    898-584 = 314
    Column vertical calculation:

			8	9	8
➖			5	8	4
			3	1	4

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 830-254
    Solution:
    830-254 = 576
    Column vertical calculation:

			1	1
			8	3	0
➖			2	5	4
			5	7	6

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 979-605
    Solution:
    979-605 = 374
    Column vertical calculation:

			9	7	9
➖			6	0	5
			3	7	4

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 897-727
    Solution:
    897-727 = 170
    Column vertical calculation:

			8	9	7
➖			7	2	7
			1	7	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 755-253
    Solution:
    755-253 = 502
    Column vertical calculation:

			7	5	5
➖			2	5	3
			5	0	2

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 659-567
    Solution:
    659-567 = 92
    Column vertical calculation:

			1
			6	5	9
➖			5	6	7
			0	9	2

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>>注：本次最多计算 7 道题。

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