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: 12×3
    Solution:
    12×3 = 36
    Column vertical calculation:

						1	2
✖							3
						3	6
						3	6

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 10×3
    Solution:
    10×3 = 30
    Column vertical calculation:

						1	0
✖							3
						3	0
						3	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×4
    Solution:
    12×4 = 48
    Column vertical calculation:

						1	2
✖							4
						4	8
						4	8

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 60×5
    Solution:
    60×5 = 300
    Column vertical calculation:

						6	0
✖							5
					3	0	0
					3	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×6
    Solution:
    21×6 = 126
    Column vertical calculation:

						2	1
✖							6
					1	2	6
					1	2	6

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 60×6
    Solution:
    60×6 = 360
    Column vertical calculation:

						6	0
✖							6
					3	6	0
					3	6	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 2×70
    Solution:
    2×70 = 140
    Column vertical calculation:

							2
✖						7	0
							0
					1	4
					1	4	0

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>>注：本次最多计算 7 道题。

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