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: 25×2
    Solution:
    25×2 = 50
    Column vertical calculation:

						2	5
✖							2
						5	0
						5	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 16×50
    Solution:
    16×50 = 800
    Column vertical calculation:

							1	6
✖							5	0
							0	0
						8	0
						8	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 27×30
    Solution:
    27×30 = 810
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 19×10
    Solution:
    19×10 = 190
    Column vertical calculation:

							1	9
✖							1	0
							0	0
						1	9
						1	9	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 25×20
    Solution:
    25×20 = 500
    Column vertical calculation:

							2	5
✖							2	0
							0	0
						5	0
						5	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 16×500
    Solution:
    16×500 = 8000
    Column vertical calculation:

								1	6
✖							5	0	0
								0	0
							0	0
						8	0
						8	0	0	0

[7/7 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

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>>注：本次最多计算 7 道题。

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