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: 1026-452
    Solution:
    1026-452 = 574
    Column vertical calculation:

			1	1
			1	0	2	6
➖				4	5	2
			0	5	7	4

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 2325-104
    Solution:
    2325-104 = 2221
    Column vertical calculation:

			2	3	2	5
➖				1	0	4
			2	2	2	1

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 655-117
    Solution:
    655-117 = 538
    Column vertical calculation:

				1
			6	5	5
➖			1	1	7
			5	3	8

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 242-178
    Solution:
    242-178 = 64
    Column vertical calculation:

			1	1
			2	4	2
➖			1	7	8
			0	6	4

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 7147-634
    Solution:
    7147-634 = 6513
    Column vertical calculation:

			1
			7	1	4	7
➖				6	3	4
			6	5	1	3

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 675-235
    Solution:
    675-235 = 440
    Column vertical calculation:

			6	7	5
➖			2	3	5
			4	4	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 875-262
    Solution:
    875-262 = 613
    Column vertical calculation:

			8	7	5
➖			2	6	2
			6	1	3

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>>注：本次最多计算 7 道题。

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