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: 25×4
    Solution:
    25×4 = 100
    Column vertical calculation:

						2	5
✖							4
					1	0	0
					1	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 23×4
    Solution:
    23×4 = 92
    Column vertical calculation:

						2	3
✖							4
						9	2
						9	2

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 43×5
    Solution:
    43×5 = 215
    Column vertical calculation:

						4	3
✖							5
					2	1	5
					2	1	5

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 80×3
    Solution:
    80×3 = 240
    Column vertical calculation:

						8	0
✖							3
					2	4	0
					2	4	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40×3
    Solution:
    40×3 = 120
    Column vertical calculation:

						4	0
✖							3
					1	2	0
					1	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×4
    Solution:
    21×4 = 84
    Column vertical calculation:

						2	1
✖							4
						8	4
						8	4

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31×4
    Solution:
    31×4 = 124
    Column vertical calculation:

						3	1
✖							4
					1	2	4
					1	2	4

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>>注：本次最多计算 7 道题。

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