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: 18×5
    Solution:
    18×5 = 90
    Column vertical calculation:

						1	8
✖							5
						9	0
						9	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 39×2
    Solution:
    39×2 = 78
    Column vertical calculation:

						3	9
✖							2
						7	8
						7	8

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 26×5
    Solution:
    26×5 = 130
    Column vertical calculation:

						2	6
✖							5
					1	3	0
					1	3	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 28×3
    Solution:
    28×3 = 84
    Column vertical calculation:

						2	8
✖							3
						8	4
						8	4

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×50
    Solution:
    18×50 = 900
    Column vertical calculation:

							1	8
✖							5	0
							0	0
						9	0
						9	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 39×20
    Solution:
    39×20 = 780
    Column vertical calculation:

							3	9
✖							2	0
							0	0
						7	8
						7	8	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 26×50
    Solution:
    26×50 = 1300
    Column vertical calculation:

							2	6
✖							5	0
							0	0
					1	3	0
					1	3	0	0

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>>注：本次最多计算 7 道题。

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