Overview: 3 questions will be solved this time.Among them
           ☆3 integer calculations

[1/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 7000×40000
    Solution:
    7000×40000 = 280000000
    Column vertical calculation:

										7	0	0	0
✖									4	0	0	0	0
										0	0	0	0
									0	0	0	0
								0	0	0	0
							0	0	0	0
					2	8	0	0	0
					2	8	0	0	0	0	0	0	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 72000×5000
    Solution:
    72000×5000 = 360000000
    Column vertical calculation:

									7	2	0	0	0
✖										5	0	0	0
									0	0	0	0	0
								0	0	0	0	0
							0	0	0	0	0
					3	6	0	0	0	0
					3	6	0	0	0	0	0	0	0

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 660000÷3000
    Solution:
    660000÷3000 = 220
    Column vertical calculation:

								2	2	0
3	0	0	0	丿	6	6	0	0	0	0
					6	0	0	0
						6	0	0	0
						6	0	0	0
									0	0
										0
										0

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