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: 34×2
    Solution:
    34×2 = 68
    Column vertical calculation:

						3	4
✖							2
						6	8
						6	8

[2/7 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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 1×39
    Solution:
    1×39 = 39
    Column vertical calculation:

							1
✖						3	9
							9
						3
						3	9

[4/7 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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 34×7
    Solution:
    34×7 = 238
    Column vertical calculation:

						3	4
✖							7
					2	3	8
					2	3	8

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 64×2
    Solution:
    64×2 = 128
    Column vertical calculation:

						6	4
✖							2
					1	2	8
					1	2	8

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 60×3
    Solution:
    60×3 = 180
    Column vertical calculation:

						6	0
✖							3
					1	8	0
					1	8	0

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>>注：本次最多计算 7 道题。

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