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: 20×3
    Solution:
    20×3 = 60
    Column vertical calculation:

						2	0
✖							3
						6	0
						6	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 38×20
    Solution:
    38×20 = 760
    Column vertical calculation:

							3	8
✖							2	0
							0	0
						7	6
						7	6	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 25×20
    Solution:
    25×20 = 500
    Column vertical calculation:

							2	5
✖							2	0
							0	0
						5	0
						5	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×40
    Solution:
    21×40 = 840
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×30
    Solution:
    20×30 = 600
    Column vertical calculation:

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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 38×200
    Solution:
    38×200 = 7600
    Column vertical calculation:

								3	8
✖							2	0	0
								0	0
							0	0
						7	6
						7	6	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 25×200
    Solution:
    25×200 = 5000
    Column vertical calculation:

								2	5
✖							2	0	0
								0	0
							0	0
						5	0
						5	0	0	0

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>>注：本次最多计算 7 道题。

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