Overview: 6 questions will be solved this time.Among them
           ☆6 integer calculations

[1/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 75×30
    Solution:
    75×30 = 2250
    Column vertical calculation:

							7	5
✖							3	0
							0	0
					2	2	5
					2	2	5	0

[2/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 64×30
    Solution:
    64×30 = 1920
    Column vertical calculation:

							6	4
✖							3	0
							0	0
					1	9	2
					1	9	2	0

[3/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 68×20
    Solution:
    68×20 = 1360
    Column vertical calculation:

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

[4/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 63×30
    Solution:
    63×30 = 1890
    Column vertical calculation:

							6	3
✖							3	0
							0	0
					1	8	9
					1	8	9	0

[5/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 75×3
    Solution:
    75×3 = 225
    Column vertical calculation:

						7	5
✖							3
					2	2	5
					2	2	5

[6/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 64×3
    Solution:
    64×3 = 192
    Column vertical calculation:

						6	4
✖							3
					1	9	2
					1	9	2

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