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: 17×30
    Solution:
    17×30 = 510
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 121×5
    Solution:
    121×5 = 605
    Column vertical calculation:

						1	2	1
✖								5
						6	0	5
						6	0	5

[3/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 150÷3
    Solution:
    150÷3 = 50
    Column vertical calculation:

			5	0
3	丿	1	5	0
		1	5
			0	0
				0
				0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 28×40
    Solution:
    28×40 = 1120
    Column vertical calculation:

							2	8
✖							4	0
							0	0
					1	1	2
					1	1	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 142×4
    Solution:
    142×4 = 568
    Column vertical calculation:

						1	4	2
✖								4
						5	6	8
						5	6	8

[6/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 120÷5
    Solution:
    120÷5 = 24
    Column vertical calculation:

			2	4
5	丿	1	2	0
		1	0
			2	0
			2	0
				0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 34×30
    Solution:
    34×30 = 1020
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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