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: 42×40
    Solution:
    42×40 = 1680
    Column vertical calculation:

							4	2
✖							4	0
							0	0
					1	6	8
					1	6	8	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 16×40
    Solution:
    16×40 = 640
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 23×200
    Solution:
    23×200 = 4600
    Column vertical calculation:

								2	3
✖							2	0	0
								0	0
							0	0
						4	6
						4	6	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 43×200
    Solution:
    43×200 = 8600
    Column vertical calculation:

								4	3
✖							2	0	0
								0	0
							0	0
						8	6
						8	6	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×400
    Solution:
    42×400 = 16800
    Column vertical calculation:

								4	2
✖							4	0	0
								0	0
							0	0
					1	6	8
					1	6	8	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 16×400
    Solution:
    16×400 = 6400
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 22×2
    Solution:
    22×2 = 44
    Column vertical calculation:

						2	2
✖							2
						4	4
						4	4

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>>注：本次最多计算 7 道题。

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