Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 13×40
    Solution:
    13×40 = 520
    Column vertical calculation:

							1	3
✖							4	0
							0	0
						5	2
						5	2	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 112×4
    Solution:
    112×4 = 448
    Column vertical calculation:

						1	1	2
✖								4
						4	4	8
						4	4	8

[3/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 220÷2
    Solution:
    220÷2 = 110
    Column vertical calculation:

		1	1	0
2	丿	2	2	0
		2
		0	2
			2
			0	0
				0
				0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 39×30
    Solution:
    39×30 = 1170
    Column vertical calculation:

							3	9
✖							3	0
							0	0
					1	1	7
					1	1	7	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 163×3
    Solution:
    163×3 = 489
    Column vertical calculation:

						1	6	3
✖								3
						4	8	9
						4	8	9

[6/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 350÷7
    Solution:
    350÷7 = 50
    Column vertical calculation:

			5	0
7	丿	3	5	0
		3	5
			0	0
				0
				0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 45×20
    Solution:
    45×20 = 900
    Column vertical calculation:

							4	5
✖							2	0
							0	0
						9	0
						9	0	0

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>>注：本次最多计算 7 道题。

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