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: 57×3
    Solution:
    57×3 = 171
    Column vertical calculation:

						5	7
✖							3
					1	7	1
					1	7	1

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 50×4
    Solution:
    50×4 = 200
    Column vertical calculation:

						5	0
✖							4
					2	0	0
					2	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 54×5
    Solution:
    54×5 = 270
    Column vertical calculation:

						5	4
✖							5
					2	7	0
					2	7	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 50×6
    Solution:
    50×6 = 300
    Column vertical calculation:

						5	0
✖							6
					3	0	0
					3	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 70×6
    Solution:
    70×6 = 420
    Column vertical calculation:

						7	0
✖							6
					4	2	0
					4	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 50×7
    Solution:
    50×7 = 350
    Column vertical calculation:

						5	0
✖							7
					3	5	0
					3	5	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 2×40
    Solution:
    2×40 = 80
    Column vertical calculation:

							2
✖						4	0
							0
						8
						8	0

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>>注：本次最多计算 7 道题。

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