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: 40×7
    Solution:
    40×7 = 280
    Column vertical calculation:

						4	0
✖							7
					2	8	0
					2	8	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×8
    Solution:
    21×8 = 168
    Column vertical calculation:

						2	1
✖							8
					1	6	8
					1	6	8

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 30×8
    Solution:
    30×8 = 240
    Column vertical calculation:

						3	0
✖							8
					2	4	0
					2	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 80×8
    Solution:
    80×8 = 640
    Column vertical calculation:

						8	0
✖							8
					6	4	0
					6	4	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 60×8
    Solution:
    60×8 = 480
    Column vertical calculation:

						6	0
✖							8
					4	8	0
					4	8	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 90×8
    Solution:
    90×8 = 720
    Column vertical calculation:

						9	0
✖							8
					7	2	0
					7	2	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×9
    Solution:
    21×9 = 189
    Column vertical calculation:

						2	1
✖							9
					1	8	9
					1	8	9

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>>注：本次最多计算 7 道题。

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