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: 31×60
    Solution:
    31×60 = 1860
    Column vertical calculation:

							3	1
✖							6	0
							0	0
					1	8	6
					1	8	6	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 150×6
    Solution:
    150×6 = 900
    Column vertical calculation:

						1	5	0
✖								6
						9	0	0
						9	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 120÷6
    Solution:
    120÷6 = 20
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 19×50
    Solution:
    19×50 = 950
    Column vertical calculation:

							1	9
✖							5	0
							0	0
						9	5
						9	5	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 123×3
    Solution:
    123×3 = 369
    Column vertical calculation:

						1	2	3
✖								3
						3	6	9
						3	6	9

[6/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 210÷3
    Solution:
    210÷3 = 70
    Column vertical calculation:

			7	0
3	丿	2	1	0
		2	1
			0	0
				0
				0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 37×50
    Solution:
    37×50 = 1850
    Column vertical calculation:

							3	7
✖							5	0
							0	0
					1	8	5
					1	8	5	0

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>>注：本次最多计算 7 道题。

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