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: 23×300
    Solution:
    23×300 = 6900
    Column vertical calculation:

								2	3
✖							3	0	0
								0	0
							0	0
						6	9
						6	9	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 60×400
    Solution:
    60×400 = 24000
    Column vertical calculation:

								6	0
✖							4	0	0
								0	0
							0	0
					2	4	0
					2	4	0	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×200
    Solution:
    20×200 = 4000
    Column vertical calculation:

								2	0
✖							2	0	0
								0	0
							0	0
						4	0
						4	0	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 14×3
    Solution:
    14×3 = 42
    Column vertical calculation:

						1	4
✖							3
						4	2
						4	2

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×3
    Solution:
    20×3 = 60
    Column vertical calculation:

						2	0
✖							3
						6	0
						6	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40×3
    Solution:
    40×3 = 120
    Column vertical calculation:

						4	0
✖							3
					1	2	0
					1	2	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 80×7
    Solution:
    80×7 = 560
    Column vertical calculation:

						8	0
✖							7
					5	6	0
					5	6	0

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>>注：本次最多计算 7 道题。

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