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: 964-103
    Solution:
    964-103 = 861
    Column vertical calculation:

			9	6	4
➖			1	0	3
			8	6	1

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 1686-936
    Solution:
    1686-936 = 750
    Column vertical calculation:

			1
			1	6	8	6
➖				9	3	6
			0	7	5	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 921-231
    Solution:
    921-231 = 690
    Column vertical calculation:

			1
			9	2	1
➖			2	3	1
			6	9	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 1302-355
    Solution:
    1302-355 = 947
    Column vertical calculation:

			1	1	1
			1	3	0	2
➖				3	5	5
			0	9	4	7

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 519-171
    Solution:
    519-171 = 348
    Column vertical calculation:

			1
			5	1	9
➖			1	7	1
			3	4	8

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 1216-612
    Solution:
    1216-612 = 604
    Column vertical calculation:

			1
			1	2	1	6
➖				6	1	2
			0	6	0	4

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 515-449
    Solution:
    515-449 = 66
    Column vertical calculation:

			1	1
			5	1	5
➖			4	4	9
			0	6	6

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>>注：本次最多计算 7 道题。

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