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: 10×3
    Solution:
    10×3 = 30
    Column vertical calculation:

						1	0
✖							3
						3	0
						3	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 28×20
    Solution:
    28×20 = 560
    Column vertical calculation:

							2	8
✖							2	0
							0	0
						5	6
						5	6	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 15×20
    Solution:
    15×20 = 300
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 11×40
    Solution:
    11×40 = 440
    Column vertical calculation:

							1	1
✖							4	0
							0	0
						4	4
						4	4	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 10×30
    Solution:
    10×30 = 300
    Column vertical calculation:

							1	0
✖							3	0
							0	0
						3	0
						3	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 28×200
    Solution:
    28×200 = 5600
    Column vertical calculation:

								2	8
✖							2	0	0
								0	0
							0	0
						5	6
						5	6	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 15×200
    Solution:
    15×200 = 3000
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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