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: 15×5
    Solution:
    15×5 = 75
    Column vertical calculation:

						1	5
✖							5
						7	5
						7	5

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 45×5
    Solution:
    45×5 = 225
    Column vertical calculation:

						4	5
✖							5
					2	2	5
					2	2	5

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 51×4
    Solution:
    51×4 = 204
    Column vertical calculation:

						5	1
✖							4
					2	0	4
					2	0	4

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 25×4
    Solution:
    25×4 = 100
    Column vertical calculation:

						2	5
✖							4
					1	0	0
					1	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 90×5
    Solution:
    90×5 = 450
    Column vertical calculation:

						9	0
✖							5
					4	5	0
					4	5	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 49×5
    Solution:
    49×5 = 245
    Column vertical calculation:

						4	9
✖							5
					2	4	5
					2	4	5

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 52×5
    Solution:
    52×5 = 260
    Column vertical calculation:

						5	2
✖							5
					2	6	0
					2	6	0

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>>注：本次最多计算 7 道题。

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