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: 14×50
    Solution:
    14×50 = 700
    Column vertical calculation:

							1	4
✖							5	0
							0	0
						7	0
						7	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 24×30
    Solution:
    24×30 = 720
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×50
    Solution:
    18×50 = 900
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 25×40
    Solution:
    25×40 = 1000
    Column vertical calculation:

							2	5
✖							4	0
							0	0
					1	0	0
					1	0	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 14×5
    Solution:
    14×5 = 70
    Column vertical calculation:

						1	4
✖							5
						7	0
						7	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 24×3
    Solution:
    24×3 = 72
    Column vertical calculation:

						2	4
✖							3
						7	2
						7	2

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×5
    Solution:
    18×5 = 90
    Column vertical calculation:

						1	8
✖							5
						9	0
						9	0

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>>注：本次最多计算 7 道题。

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