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: 90×9
    Solution:
    90×9 = 810
    Column vertical calculation:

						9	0
✖							9
					8	1	0
					8	1	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 30×9
    Solution:
    30×9 = 270
    Column vertical calculation:

						3	0
✖							9
					2	7	0
					2	7	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 50×9
    Solution:
    50×9 = 450
    Column vertical calculation:

						5	0
✖							9
					4	5	0
					4	5	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 32×5
    Solution:
    32×5 = 160
    Column vertical calculation:

						3	2
✖							5
					1	6	0
					1	6	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 32×6
    Solution:
    32×6 = 192
    Column vertical calculation:

						3	2
✖							6
					1	9	2
					1	9	2

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 32×2
    Solution:
    32×2 = 64
    Column vertical calculation:

						3	2
✖							2
						6	4
						6	4

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 2×60
    Solution:
    2×60 = 120
    Column vertical calculation:

							2
✖						6	0
							0
					1	2
					1	2	0

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>>注：本次最多计算 7 道题。

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