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: 30×4
    Solution:
    30×4 = 120
    Column vertical calculation:

						3	0
✖							4
					1	2	0
					1	2	0

[2/7 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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 29×30
    Solution:
    29×30 = 870
    Column vertical calculation:

							2	9
✖							3	0
							0	0
						8	7
						8	7	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 23×50
    Solution:
    23×50 = 1150
    Column vertical calculation:

							2	3
✖							5	0
							0	0
					1	1	5
					1	1	5	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 30×40
    Solution:
    30×40 = 1200
    Column vertical calculation:

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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 19×500
    Solution:
    19×500 = 9500
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 29×300
    Solution:
    29×300 = 8700
    Column vertical calculation:

								2	9
✖							3	0	0
								0	0
							0	0
						8	7
						8	7	0	0

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>>注：本次最多计算 7 道题。

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