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: 15×18
    Solution:
    15×18 = 270
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 25×31
    Solution:
    25×31 = 775
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×15
    Solution:
    42×15 = 630
    Column vertical calculation:

							4	2
✖							1	5
						2	1	0
						4	2
						6	3	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×15
    Solution:
    18×15 = 270
    Column vertical calculation:

							1	8
✖							1	5
							9	0
						1	8
						2	7	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 25×22
    Solution:
    25×22 = 550
    Column vertical calculation:

							2	5
✖							2	2
							5	0
						5	0
						5	5	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 15×56
    Solution:
    15×56 = 840
    Column vertical calculation:

							1	5
✖							5	6
							9	0
						7	5
						8	4	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 35×11
    Solution:
    35×11 = 385
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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