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: 41×200
    Solution:
    41×200 = 8200
    Column vertical calculation:

								4	1
✖							2	0	0
								0	0
							0	0
						8	2
						8	2	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40×400
    Solution:
    40×400 = 16000
    Column vertical calculation:

								4	0
✖							4	0	0
								0	0
							0	0
					1	6	0
					1	6	0	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 14×400
    Solution:
    14×400 = 5600
    Column vertical calculation:

								1	4
✖							4	0	0
								0	0
							0	0
						5	6
						5	6	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31×1
    Solution:
    31×1 = 31
    Column vertical calculation:

						3	1
✖							1
						3	1
						3	1

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 23×3
    Solution:
    23×3 = 69
    Column vertical calculation:

						2	3
✖							3
						6	9
						6	9

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 60×4
    Solution:
    60×4 = 240
    Column vertical calculation:

						6	0
✖							4
					2	4	0
					2	4	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×2
    Solution:
    20×2 = 40
    Column vertical calculation:

						2	0
✖							2
						4	0
						4	0

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>>注：本次最多计算 7 道题。

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