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: 38×40
    Solution:
    38×40 = 1520
    Column vertical calculation:

							3	8
✖							4	0
							0	0
					1	5	2
					1	5	2	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 162×4
    Solution:
    162×4 = 648
    Column vertical calculation:

						1	6	2
✖								4
						6	4	8
						6	4	8

[3/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 280÷7
    Solution:
    280÷7 = 40
    Column vertical calculation:

			4	0
7	丿	2	8	0
		2	8
			0	0
				0
				0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 73×40
    Solution:
    73×40 = 2920
    Column vertical calculation:

							7	3
✖							4	0
							0	0
					2	9	2
					2	9	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 232×4
    Solution:
    232×4 = 928
    Column vertical calculation:

						2	3	2
✖								4
						9	2	8
						9	2	8

[6/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 280÷14
    Solution:
    280÷14 = 20
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 79×30
    Solution:
    79×30 = 2370
    Column vertical calculation:

							7	9
✖							3	0
							0	0
					2	3	7
					2	3	7	0

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>>注：本次最多计算 7 道题。

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