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: 40×3
    Solution:
    40×3 = 120
    Column vertical calculation:

						4	0
✖							3
					1	2	0
					1	2	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 3×70
    Solution:
    3×70 = 210
    Column vertical calculation:

							3
✖						7	0
							0
					2	1
					2	1	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 7×80
    Solution:
    7×80 = 560
    Column vertical calculation:

							7
✖						8	0
							0
					5	6
					5	6	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 43×6
    Solution:
    43×6 = 258
    Column vertical calculation:

						4	3
✖							6
					2	5	8
					2	5	8

[5/7 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

[6/7 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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 41×7
    Solution:
    41×7 = 287
    Column vertical calculation:

						4	1
✖							7
					2	8	7
					2	8	7

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>>注：本次最多计算 7 道题。

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