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: 20×20
    Solution:
    20×20 = 400
    Column vertical calculation:

							2	0
✖							2	0
							0	0
						4	0
						4	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 15×30
    Solution:
    15×30 = 450
    Column vertical calculation:

							1	5
✖							3	0
							0	0
						4	5
						4	5	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 27×300
    Solution:
    27×300 = 8100
    Column vertical calculation:

								2	7
✖							3	0	0
								0	0
							0	0
						8	1
						8	1	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 16×300
    Solution:
    16×300 = 4800
    Column vertical calculation:

								1	6
✖							3	0	0
								0	0
							0	0
						4	8
						4	8	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×200
    Solution:
    20×200 = 4000
    Column vertical calculation:

								2	0
✖							2	0	0
								0	0
							0	0
						4	0
						4	0	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 15×300
    Solution:
    15×300 = 4500
    Column vertical calculation:

								1	5
✖							3	0	0
								0	0
							0	0
						4	5
						4	5	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 37×6
    Solution:
    37×6 = 222
    Column vertical calculation:

						3	7
✖							6
					2	2	2
					2	2	2

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>>注：本次最多计算 7 道题。

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