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: 722×2
    Solution:
    722×2 = 1444
    Column vertical calculation:

						7	2	2
✖								2
					1	4	4	4
					1	4	4	4

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 538×9
    Solution:
    538×9 = 4842
    Column vertical calculation:

						5	3	8
✖								9
					4	8	4	2
					4	8	4	2

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 511×3
    Solution:
    511×3 = 1533
    Column vertical calculation:

						5	1	1
✖								3
					1	5	3	3
					1	5	3	3

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 604×2
    Solution:
    604×2 = 1208
    Column vertical calculation:

						6	0	4
✖								2
					1	2	0	8
					1	2	0	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 239×4
    Solution:
    239×4 = 956
    Column vertical calculation:

						2	3	9
✖								4
						9	5	6
						9	5	6

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 8×602
    Solution:
    8×602 = 4816
    Column vertical calculation:

								8
✖						6	0	2
							1	6
							0
					4	8
					4	8	1	6

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 663×2
    Solution:
    663×2 = 1326
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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