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: 35×2
    Solution:
    35×2 = 70
    Column vertical calculation:

						3	5
✖							2
						7	0
						7	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 26×30
    Solution:
    26×30 = 780
    Column vertical calculation:

							2	6
✖							3	0
							0	0
						7	8
						7	8	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 14×30
    Solution:
    14×30 = 420
    Column vertical calculation:

							1	4
✖							3	0
							0	0
						4	2
						4	2	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×20
    Solution:
    18×20 = 360
    Column vertical calculation:

							1	8
✖							2	0
							0	0
						3	6
						3	6	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 35×20
    Solution:
    35×20 = 700
    Column vertical calculation:

							3	5
✖							2	0
							0	0
						7	0
						7	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 26×300
    Solution:
    26×300 = 7800
    Column vertical calculation:

								2	6
✖							3	0	0
								0	0
							0	0
						7	8
						7	8	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 13×300
    Solution:
    13×300 = 3900
    Column vertical calculation:

								1	3
✖							3	0	0
								0	0
							0	0
						3	9
						3	9	0	0

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>>注：本次最多计算 7 道题。

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