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: 52×2
    Solution:
    52×2 = 104
    Column vertical calculation:

						5	2
✖							2
					1	0	4
					1	0	4

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 55×3
    Solution:
    55×3 = 165
    Column vertical calculation:

						5	5
✖							3
					1	6	5
					1	6	5

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×1
    Solution:
    12×1 = 12
    Column vertical calculation:

						1	2
✖							1
						1	2
						1	2

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×3
    Solution:
    12×3 = 36
    Column vertical calculation:

						1	2
✖							3
						3	6
						3	6

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40×2
    Solution:
    40×2 = 80
    Column vertical calculation:

						4	0
✖							2
						8	0
						8	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×3
    Solution:
    42×3 = 126
    Column vertical calculation:

						4	2
✖							3
					1	2	6
					1	2	6

[7/7 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

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>>注：本次最多计算 7 道题。

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