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: 12900×20000
    Solution:
    12900×20000 = 258000000
    Column vertical calculation:

										1	2	9	0	0
✖										2	0	0	0	0
										0	0	0	0	0
									0	0	0	0	0
								0	0	0	0	0
							0	0	0	0	0
						2	5	8	0	0
						2	5	8	0	0	0	0	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 280000×8000
    Solution:
    280000×8000 = 2240000000
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 1280000÷20000
    Solution:
    1280000÷20000 = 64
    Column vertical calculation:

											6	4
2	0	0	0	0	丿	1	2	8	0	0	0	0
						1	2	0	0	0	0
								8	0	0	0	0
								8	0	0	0	0
												0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21000×80000
    Solution:
    21000×80000 = 1680000000
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 61000×20000
    Solution:
    61000×20000 = 1220000000
    Column vertical calculation:

										6	1	0	0	0
✖										2	0	0	0	0
										0	0	0	0	0
									0	0	0	0	0
								0	0	0	0	0
							0	0	0	0	0
					1	2	2	0	0	0
					1	2	2	0	0	0	0	0	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 1310000÷5000
    Solution:
    1310000÷5000 = 262
    Column vertical calculation:

									2	6	2
5	0	0	0	丿	1	3	1	0	0	0	0
					1	0	0	0	0
						3	1	0	0	0
						3	0	0	0	0
							1	0	0	0	0
							1	0	0	0	0
											0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 5200×30000
    Solution:
    5200×30000 = 156000000
    Column vertical calculation:

										5	2	0	0
✖									3	0	0	0	0
										0	0	0	0
									0	0	0	0
								0	0	0	0
							0	0	0	0
					1	5	6	0	0
					1	5	6	0	0	0	0	0	0

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>>注：本次最多计算 7 道题。

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