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: 21×3
    Solution:
    21×3 = 63
    Column vertical calculation:

						2	1
✖							3
						6	3
						6	3

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 17×8
    Solution:
    17×8 = 136
    Column vertical calculation:

						1	7
✖							8
					1	3	6
					1	3	6

[3/7 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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 60×3
    Solution:
    60×3 = 180
    Column vertical calculation:

						6	0
✖							3
					1	8	0
					1	8	0

[5/7 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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 60×4
    Solution:
    60×4 = 240
    Column vertical calculation:

						6	0
✖							4
					2	4	0
					2	4	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 4×70
    Solution:
    4×70 = 280
    Column vertical calculation:

							4
✖						7	0
							0
					2	8
					2	8	0

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>>注：本次最多计算 7 道题。

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