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: 20×3
    Solution:
    20×3 = 60
    Column vertical calculation:

						2	0
✖							3
						6	0
						6	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×4
    Solution:
    20×4 = 80
    Column vertical calculation:

						2	0
✖							4
						8	0
						8	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 24×5
    Solution:
    24×5 = 120
    Column vertical calculation:

						2	4
✖							5
					1	2	0
					1	2	0

[4/7 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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40×6
    Solution:
    40×6 = 240
    Column vertical calculation:

						4	0
✖							6
					2	4	0
					2	4	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×7
    Solution:
    20×7 = 140
    Column vertical calculation:

						2	0
✖							7
					1	4	0
					1	4	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 2×70
    Solution:
    2×70 = 140
    Column vertical calculation:

							2
✖						7	0
							0
					1	4
					1	4	0

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>>注：本次最多计算 7 道题。

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