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: 40×30
    Solution:
    40×30 = 1200
    Column vertical calculation:

							4	0
✖							3	0
							0	0
					1	2	0
					1	2	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 80×70
    Solution:
    80×70 = 5600
    Column vertical calculation:

							8	0
✖							7	0
							0	0
					5	6	0
					5	6	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 14×300
    Solution:
    14×300 = 4200
    Column vertical calculation:

								1	4
✖							3	0	0
								0	0
							0	0
						4	2
						4	2	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×300
    Solution:
    20×300 = 6000
    Column vertical calculation:

								2	0
✖							3	0	0
								0	0
							0	0
						6	0
						6	0	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40×300
    Solution:
    40×300 = 12000
    Column vertical calculation:

								4	0
✖							3	0	0
								0	0
							0	0
					1	2	0
					1	2	0	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 80×700
    Solution:
    80×700 = 56000
    Column vertical calculation:

								8	0
✖							7	0	0
								0	0
							0	0
					5	6	0
					5	6	0	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 28×2
    Solution:
    28×2 = 56
    Column vertical calculation:

						2	8
✖							2
						5	6
						5	6

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>>注：本次最多计算 7 道题。

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