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: 40×4
    Solution:
    40×4 = 160
    Column vertical calculation:

						4	0
✖							4
					1	6	0
					1	6	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×5
    Solution:
    42×5 = 210
    Column vertical calculation:

						4	2
✖							5
					2	1	0
					2	1	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40×7
    Solution:
    40×7 = 280
    Column vertical calculation:

						4	0
✖							7
					2	8	0
					2	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 41×8
    Solution:
    41×8 = 328
    Column vertical calculation:

						4	1
✖							8
					3	2	8
					3	2	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 8×90
    Solution:
    8×90 = 720
    Column vertical calculation:

							8
✖						9	0
							0
					7	2
					7	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40×6
    Solution:
    40×6 = 240
    Column vertical calculation:

						4	0
✖							6
					2	4	0
					2	4	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 8×60
    Solution:
    8×60 = 480
    Column vertical calculation:

							8
✖						6	0
							0
					4	8
					4	8	0

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>>注：本次最多计算 7 道题。

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