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: 70×5
    Solution:
    70×5 = 350
    Column vertical calculation:

						7	0
✖							5
					3	5	0
					3	5	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 11×6
    Solution:
    11×6 = 66
    Column vertical calculation:

						1	1
✖							6
						6	6
						6	6

[3/7 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

[4/7 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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×6
    Solution:
    20×6 = 120
    Column vertical calculation:

						2	0
✖							6
					1	2	0
					1	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×6
    Solution:
    21×6 = 126
    Column vertical calculation:

						2	1
✖							6
					1	2	6
					1	2	6

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 70×6
    Solution:
    70×6 = 420
    Column vertical calculation:

						7	0
✖							6
					4	2	0
					4	2	0

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>>注：本次最多计算 7 道题。

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