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: 579-436
    Solution:
    579-436 = 143
    Column vertical calculation:

			5	7	9
➖			4	3	6
			1	4	3

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 1258-648
    Solution:
    1258-648 = 610
    Column vertical calculation:

			1
			1	2	5	8
➖				6	4	8
			0	6	1	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 467-358
    Solution:
    467-358 = 109
    Column vertical calculation:

				1
			4	6	7
➖			3	5	8
			1	0	9

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 258-138
    Solution:
    258-138 = 120
    Column vertical calculation:

			2	5	8
➖			1	3	8
			1	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 653-259
    Solution:
    653-259 = 394
    Column vertical calculation:

			1	1
			6	5	3
➖			2	5	9
			3	9	4

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 368-233
    Solution:
    368-233 = 135
    Column vertical calculation:

			3	6	8
➖			2	3	3
			1	3	5

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 1136-845
    Solution:
    1136-845 = 291
    Column vertical calculation:

			1	1
			1	1	3	6
➖				8	4	5
			0	2	9	1

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>>注：本次最多计算 7 道题。

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