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: 12×2
    Solution:
    12×2 = 24
    Column vertical calculation:

						1	2
✖							2
						2	4
						2	4

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 55×4
    Solution:
    55×4 = 220
    Column vertical calculation:

						5	5
✖							4
					2	2	0
					2	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 22×3
    Solution:
    22×3 = 66
    Column vertical calculation:

						2	2
✖							3
						6	6
						6	6

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 29×3
    Solution:
    29×3 = 87
    Column vertical calculation:

						2	9
✖							3
						8	7
						8	7

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40×4
    Solution:
    40×4 = 160
    Column vertical calculation:

						4	0
✖							4
					1	6	0
					1	6	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×4
    Solution:
    42×4 = 168
    Column vertical calculation:

						4	2
✖							4
					1	6	8
					1	6	8

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 50×4
    Solution:
    50×4 = 200
    Column vertical calculation:

						5	0
✖							4
					2	0	0
					2	0	0

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>>注：本次最多计算 7 道题。

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