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: 15×6
    Solution:
    15×6 = 90
    Column vertical calculation:

						1	5
✖							6
						9	0
						9	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 45×6
    Solution:
    45×6 = 270
    Column vertical calculation:

						4	5
✖							6
					2	7	0
					2	7	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 61×4
    Solution:
    61×4 = 244
    Column vertical calculation:

						6	1
✖							4
					2	4	4
					2	4	4

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 26×4
    Solution:
    26×4 = 104
    Column vertical calculation:

						2	6
✖							4
					1	0	4
					1	0	4

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 90×6
    Solution:
    90×6 = 540
    Column vertical calculation:

						9	0
✖							6
					5	4	0
					5	4	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 49×6
    Solution:
    49×6 = 294
    Column vertical calculation:

						4	9
✖							6
					2	9	4
					2	9	4

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 52×6
    Solution:
    52×6 = 312
    Column vertical calculation:

						5	2
✖							6
					3	1	2
					3	1	2

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>>注：本次最多计算 7 道题。

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