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: 18×4
    Solution:
    18×4 = 72
    Column vertical calculation:

						1	8
✖							4
						7	2
						7	2

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×3
    Solution:
    42×3 = 126
    Column vertical calculation:

						4	2
✖							3
					1	2	6
					1	2	6

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 13×2
    Solution:
    13×2 = 26
    Column vertical calculation:

						1	3
✖							2
						2	6
						2	6

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 26×3
    Solution:
    26×3 = 78
    Column vertical calculation:

						2	6
✖							3
						7	8
						7	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×40
    Solution:
    18×40 = 720
    Column vertical calculation:

							1	8
✖							4	0
							0	0
						7	2
						7	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×30
    Solution:
    42×30 = 1260
    Column vertical calculation:

							4	2
✖							3	0
							0	0
					1	2	6
					1	2	6	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 13×20
    Solution:
    13×20 = 260
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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