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: 663-206
    Solution:
    663-206 = 457
    Column vertical calculation:

				1
			6	6	3
➖			2	0	6
			4	5	7

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 775-505
    Solution:
    775-505 = 270
    Column vertical calculation:

			7	7	5
➖			5	0	5
			2	7	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 644-264
    Solution:
    644-264 = 380
    Column vertical calculation:

			1
			6	4	4
➖			2	6	4
			3	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 857-423
    Solution:
    857-423 = 434
    Column vertical calculation:

			8	5	7
➖			4	2	3
			4	3	4

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 537-385
    Solution:
    537-385 = 152
    Column vertical calculation:

			1
			5	3	7
➖			3	8	5
			1	5	2

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 1102-534
    Solution:
    1102-534 = 568
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 861-146
    Solution:
    861-146 = 715
    Column vertical calculation:

				1
			8	6	1
➖			1	4	6
			7	1	5

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>>注：本次最多计算 7 道题。

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