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: 64×50
    Solution:
    64×50 = 3200
    Column vertical calculation:

							6	4
✖							5	0
							0	0
					3	2	0
					3	2	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 74×30
    Solution:
    74×30 = 2220
    Column vertical calculation:

							7	4
✖							3	0
							0	0
					2	2	2
					2	2	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 68×50
    Solution:
    68×50 = 3400
    Column vertical calculation:

							6	8
✖							5	0
							0	0
					3	4	0
					3	4	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 75×40
    Solution:
    75×40 = 3000
    Column vertical calculation:

							7	5
✖							4	0
							0	0
					3	0	0
					3	0	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 64×5
    Solution:
    64×5 = 320
    Column vertical calculation:

						6	4
✖							5
					3	2	0
					3	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 74×3
    Solution:
    74×3 = 222
    Column vertical calculation:

						7	4
✖							3
					2	2	2
					2	2	2

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 68×5
    Solution:
    68×5 = 340
    Column vertical calculation:

						6	8
✖							5
					3	4	0
					3	4	0

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>>注：本次最多计算 7 道题。

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