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: 503×2
    Solution:
    503×2 = 1006
    Column vertical calculation:

						5	0	3
✖								2
					1	0	0	6
					1	0	0	6

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 520×3
    Solution:
    520×3 = 1560
    Column vertical calculation:

						5	2	0
✖								3
					1	5	6	0
					1	5	6	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 302×4
    Solution:
    302×4 = 1208
    Column vertical calculation:

						3	0	2
✖								4
					1	2	0	8
					1	2	0	8

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 703×6
    Solution:
    703×6 = 4218
    Column vertical calculation:

						7	0	3
✖								6
					4	2	1	8
					4	2	1	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 307×3
    Solution:
    307×3 = 921
    Column vertical calculation:

						3	0	7
✖								3
						9	2	1
						9	2	1

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 405×2
    Solution:
    405×2 = 810
    Column vertical calculation:

						4	0	5
✖								2
						8	1	0
						8	1	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 303×8
    Solution:
    303×8 = 2424
    Column vertical calculation:

						3	0	3
✖								8
					2	4	2	4
					2	4	2	4

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>>注：本次最多计算 7 道题。

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