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: 15×4
    Solution:
    15×4 = 60
    Column vertical calculation:

						1	5
✖							4
						6	0
						6	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 45×9
    Solution:
    45×9 = 405
    Column vertical calculation:

						4	5
✖							9
					4	0	5
					4	0	5

[3/7 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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 29×4
    Solution:
    29×4 = 116
    Column vertical calculation:

						2	9
✖							4
					1	1	6
					1	1	6

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 90×4
    Solution:
    90×4 = 360
    Column vertical calculation:

						9	0
✖							4
					3	6	0
					3	6	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 49×9
    Solution:
    49×9 = 441
    Column vertical calculation:

						4	9
✖							9
					4	4	1
					4	4	1

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 52×4
    Solution:
    52×4 = 208
    Column vertical calculation:

						5	2
✖							4
					2	0	8
					2	0	8

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>>注：本次最多计算 7 道题。

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