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: 30×60
    Solution:
    30×60 = 1800
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 144×2
    Solution:
    144×2 = 288
    Column vertical calculation:

						1	4	4
✖								2
						2	8	8
						2	8	8

[3/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 140÷5
    Solution:
    140÷5 = 28
    Column vertical calculation:

			2	8
5	丿	1	4	0
		1	0
			4	0
			4	0
				0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 22×30
    Solution:
    22×30 = 660
    Column vertical calculation:

							2	2
✖							3	0
							0	0
						6	6
						6	6	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 131×5
    Solution:
    131×5 = 655
    Column vertical calculation:

						1	3	1
✖								5
						6	5	5
						6	5	5

[6/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 120÷4
    Solution:
    120÷4 = 30
    Column vertical calculation:

			3	0
4	丿	1	2	0
		1	2
			0	0
				0
				0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 87×50
    Solution:
    87×50 = 4350
    Column vertical calculation:

							8	7
✖							5	0
							0	0
					4	3	5
					4	3	5	0

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>>注：本次最多计算 7 道题。

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