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: 12×4
    Solution:
    12×4 = 48
    Column vertical calculation:

						1	2
✖							4
						4	8
						4	8

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 22×30
    Solution:
    22×30 = 660
    Column vertical calculation:

							2	2
✖							3	0
							0	0
						6	6
						6	6	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 60×20
    Solution:
    60×20 = 1200
    Column vertical calculation:

							6	0
✖							2	0
							0	0
					1	2	0
					1	2	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×30
    Solution:
    12×30 = 360
    Column vertical calculation:

							1	2
✖							3	0
							0	0
						3	6
						3	6	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×40
    Solution:
    12×40 = 480
    Column vertical calculation:

							1	2
✖							4	0
							0	0
						4	8
						4	8	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 22×300
    Solution:
    22×300 = 6600
    Column vertical calculation:

								2	2
✖							3	0	0
								0	0
							0	0
						6	6
						6	6	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 60×200
    Solution:
    60×200 = 12000
    Column vertical calculation:

								6	0
✖							2	0	0
								0	0
							0	0
					1	2	0
					1	2	0	0	0

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>>注：本次最多计算 7 道题。

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