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: 17×4
    Solution:
    17×4 = 68
    Column vertical calculation:

						1	7
✖							4
						6	8
						6	8

[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: 18×20
    Solution:
    18×20 = 360
    Column vertical calculation:

							1	8
✖							2	0
							0	0
						3	6
						3	6	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×20
    Solution:
    20×20 = 400
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 17×40
    Solution:
    17×40 = 680
    Column vertical calculation:

							1	7
✖							4	0
							0	0
						6	8
						6	8	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: 18×200
    Solution:
    18×200 = 3600
    Column vertical calculation:

								1	8
✖							2	0	0
								0	0
							0	0
						3	6
						3	6	0	0

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>>注：本次最多计算 7 道题。

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