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: 272×2
    Solution:
    272×2 = 544
    Column vertical calculation:

						2	7	2
✖								2
						5	4	4
						5	4	4

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 545×9
    Solution:
    545×9 = 4905
    Column vertical calculation:

						5	4	5
✖								9
					4	9	0	5
					4	9	0	5

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 151×3
    Solution:
    151×3 = 453
    Column vertical calculation:

						1	5	1
✖								3
						4	5	3
						4	5	3

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 636×2
    Solution:
    636×2 = 1272
    Column vertical calculation:

						6	3	6
✖								2
					1	2	7	2
					1	2	7	2

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 323×4
    Solution:
    323×4 = 1292
    Column vertical calculation:

						3	2	3
✖								4
					1	2	9	2
					1	2	9	2

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 8×858
    Solution:
    8×858 = 6864
    Column vertical calculation:

								8
✖						8	5	8
							6	4
						4	0
					6	4
					6	8	6	4

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 359×2
    Solution:
    359×2 = 718
    Column vertical calculation:

						3	5	9
✖								2
						7	1	8
						7	1	8

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>>注：本次最多计算 7 道题。

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