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: 15×4
    Solution:
    15×4 = 60
    Column vertical calculation:

						1	5
✖							4
						6	0
						6	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 51×4
    Solution:
    51×4 = 204
    Column vertical calculation:

						5	1
✖							4
					2	0	4
					2	0	4

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×4
    Solution:
    42×4 = 168
    Column vertical calculation:

						4	2
✖							4
					1	6	8
					1	6	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 30×4
    Solution:
    30×4 = 120
    Column vertical calculation:

						3	0
✖							4
					1	2	0
					1	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 11×8
    Solution:
    11×8 = 88
    Column vertical calculation:

						1	1
✖							8
						8	8
						8	8

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 15×6
    Solution:
    15×6 = 90
    Column vertical calculation:

						1	5
✖							6
						9	0
						9	0

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>>注：本次最多计算 7 道题。

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