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: 70×9
    Solution:
    70×9 = 630
    Column vertical calculation:

						7	0
✖							9
					6	3	0
					6	3	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 10×9
    Solution:
    10×9 = 90
    Column vertical calculation:

						1	0
✖							9
						9	0
						9	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 30×9
    Solution:
    30×9 = 270
    Column vertical calculation:

						3	0
✖							9
					2	7	0
					2	7	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×6
    Solution:
    12×6 = 72
    Column vertical calculation:

						1	2
✖							6
						7	2
						7	2

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 16×2
    Solution:
    16×2 = 32
    Column vertical calculation:

						1	6
✖							2
						3	2
						3	2

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×2
    Solution:
    12×2 = 24
    Column vertical calculation:

						1	2
✖							2
						2	4
						2	4

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 2×80
    Solution:
    2×80 = 160
    Column vertical calculation:

							2
✖						8	0
							0
					1	6
					1	6	0

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>>注：本次最多计算 7 道题。

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