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: 3×80
    Solution:
    3×80 = 240
    Column vertical calculation:

							3
✖						8	0
							0
					2	4
					2	4	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 29×7
    Solution:
    29×7 = 203
    Column vertical calculation:

						2	9
✖							7
					2	0	3
					2	0	3

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 24×6
    Solution:
    24×6 = 144
    Column vertical calculation:

						2	4
✖							6
					1	4	4
					1	4	4

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×4
    Solution:
    21×4 = 84
    Column vertical calculation:

						2	1
✖							4
						8	4
						8	4

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 15×7
    Solution:
    15×7 = 105
    Column vertical calculation:

						1	5
✖							7
					1	0	5
					1	0	5

[7/7 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

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>>注：本次最多计算 7 道题。

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