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: 55×6
    Solution:
    55×6 = 330
    Column vertical calculation:

						5	5
✖							6
					3	3	0
					3	3	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 25×9
    Solution:
    25×9 = 225
    Column vertical calculation:

						2	5
✖							9
					2	2	5
					2	2	5

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×2
    Solution:
    21×2 = 42
    Column vertical calculation:

						2	1
✖							2
						4	2
						4	2

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 29×2
    Solution:
    29×2 = 58
    Column vertical calculation:

						2	9
✖							2
						5	8
						5	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 90×2
    Solution:
    90×2 = 180
    Column vertical calculation:

						9	0
✖							2
					1	8	0
					1	8	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 29×9
    Solution:
    29×9 = 261
    Column vertical calculation:

						2	9
✖							9
					2	6	1
					2	6	1

[7/7 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

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>>注：本次最多计算 7 道题。

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