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: 3×50
    Solution:
    3×50 = 150
    Column vertical calculation:

							3
✖						5	0
							0
					1	5
					1	5	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 7×60
    Solution:
    7×60 = 420
    Column vertical calculation:

							7
✖						6	0
							0
					4	2
					4	2	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 23×6
    Solution:
    23×6 = 138
    Column vertical calculation:

						2	3
✖							6
					1	3	8
					1	3	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 80×6
    Solution:
    80×6 = 480
    Column vertical calculation:

						8	0
✖							6
					4	8	0
					4	8	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: 21×7
    Solution:
    21×7 = 147
    Column vertical calculation:

						2	1
✖							7
					1	4	7
					1	4	7

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>>注：本次最多计算 7 道题。

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