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: 522-217
    Solution:
    522-217 = 305
    Column vertical calculation:

				1
			5	2	2
➖			2	1	7
			3	0	5

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 156-96
    Solution:
    156-96 = 60
    Column vertical calculation:

			1
			1	5	6
➖				9	6
			0	6	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 247-125
    Solution:
    247-125 = 122
    Column vertical calculation:

			2	4	7
➖			1	2	5
			1	2	2

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 145-45
    Solution:
    145-45 = 100
    Column vertical calculation:

			1	4	5
➖				4	5
			1	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 726-424
    Solution:
    726-424 = 302
    Column vertical calculation:

			7	2	6
➖			4	2	4
			3	0	2

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 473-455
    Solution:
    473-455 = 18
    Column vertical calculation:

				1
			4	7	3
➖			4	5	5
			0	1	8

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 1042-213
    Solution:
    1042-213 = 829
    Column vertical calculation:

			1		1
			1	0	4	2
➖				2	1	3
			0	8	2	9

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>>注：本次最多计算 7 道题。

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