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: 658-189
    Solution:
    658-189 = 469
    Column vertical calculation:

			1	1
			6	5	8
➖			1	8	9
			4	6	9

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 2920-575
    Solution:
    2920-575 = 2345
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 2920-2345
    Solution:
    2920-2345 = 575
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 3043-575
    Solution:
    3043-575 = 2468
    Column vertical calculation:

			1	1	1
			3	0	4	3
➖				5	7	5
			2	4	6	8

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 1862-902
    Solution:
    1862-902 = 960
    Column vertical calculation:

			1
			1	8	6	2
➖				9	0	2
			0	9	6	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 858-239
    Solution:
    858-239 = 619
    Column vertical calculation:

				1
			8	5	8
➖			2	3	9
			6	1	9

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 357-218
    Solution:
    357-218 = 139
    Column vertical calculation:

				1
			3	5	7
➖			2	1	8
			1	3	9

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>>注：本次最多计算 7 道题。

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