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: 30×3
    Solution:
    30×3 = 90
    Column vertical calculation:

						3	0
✖							3
						9	0
						9	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 3×60
    Solution:
    3×60 = 180
    Column vertical calculation:

							3
✖						6	0
							0
					1	8
					1	8	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 7×70
    Solution:
    7×70 = 490
    Column vertical calculation:

							7
✖						7	0
							0
					4	9
					4	9	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 33×6
    Solution:
    33×6 = 198
    Column vertical calculation:

						3	3
✖							6
					1	9	8
					1	9	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 90×6
    Solution:
    90×6 = 540
    Column vertical calculation:

						9	0
✖							6
					5	4	0
					5	4	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 30×7
    Solution:
    30×7 = 210
    Column vertical calculation:

						3	0
✖							7
					2	1	0
					2	1	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31×7
    Solution:
    31×7 = 217
    Column vertical calculation:

						3	1
✖							7
					2	1	7
					2	1	7

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>>注：本次最多计算 7 道题。

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