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: 25×15
    Solution:
    25×15 = 375
    Column vertical calculation:

							2	5
✖							1	5
						1	2	5
						2	5
						3	7	5

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 45×21
    Solution:
    45×21 = 945
    Column vertical calculation:

							4	5
✖							2	1
							4	5
						9	0
						9	4	5

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 35×49
    Solution:
    35×49 = 1715
    Column vertical calculation:

							3	5
✖							4	9
						3	1	5
					1	4	0
					1	7	1	5

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 52×14
    Solution:
    52×14 = 728
    Column vertical calculation:

							5	2
✖							1	4
						2	0	8
						5	2
						7	2	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31×51
    Solution:
    31×51 = 1581
    Column vertical calculation:

							3	1
✖							5	1
							3	1
					1	5	5
					1	5	8	1

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 25×19
    Solution:
    25×19 = 475
    Column vertical calculation:

							2	5
✖							1	9
						2	2	5
						2	5
						4	7	5

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 15×15
    Solution:
    15×15 = 225
    Column vertical calculation:

							1	5
✖							1	5
							7	5
						1	5
						2	2	5

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>>注：本次最多计算 7 道题。

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