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: 421-25
    Solution:
    421-25 = 396
    Column vertical calculation:

			1	1
			4	2	1
➖				2	5
			3	9	6

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 622-25
    Solution:
    622-25 = 597
    Column vertical calculation:

			1	1
			6	2	2
➖				2	5
			5	9	7

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 985-34
    Solution:
    985-34 = 951
    Column vertical calculation:

			9	8	5
➖				3	4
			9	5	1

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 634-36
    Solution:
    634-36 = 598
    Column vertical calculation:

			1	1
			6	3	4
➖				3	6
			5	9	8

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 621-36
    Solution:
    621-36 = 585
    Column vertical calculation:

			1	1
			6	2	1
➖				3	6
			5	8	5

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 473-36
    Solution:
    473-36 = 437
    Column vertical calculation:

				1
			4	7	3
➖				3	6
			4	3	7

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 762-54
    Solution:
    762-54 = 708
    Column vertical calculation:

				1
			7	6	2
➖				5	4
			7	0	8

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>>注：本次最多计算 7 道题。

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