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: 420×6
    Solution:
    420×6 = 2520
    Column vertical calculation:

						4	2	0
✖								6
					2	5	2	0
					2	5	2	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 370×5
    Solution:
    370×5 = 1850
    Column vertical calculation:

						3	7	0
✖								5
					1	8	5	0
					1	8	5	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 130×9
    Solution:
    130×9 = 1170
    Column vertical calculation:

						1	3	0
✖								9
					1	1	7	0
					1	1	7	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 260×7
    Solution:
    260×7 = 1820
    Column vertical calculation:

						2	6	0
✖								7
					1	8	2	0
					1	8	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 306×2
    Solution:
    306×2 = 612
    Column vertical calculation:

						3	0	6
✖								2
						6	1	2
						6	1	2

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 340×2
    Solution:
    340×2 = 680
    Column vertical calculation:

						3	4	0
✖								2
						6	8	0
						6	8	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 240×2
    Solution:
    240×2 = 480
    Column vertical calculation:

						2	4	0
✖								2
						4	8	0
						4	8	0

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>>注：本次最多计算 7 道题。

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