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: 21×2
    Solution:
    21×2 = 42
    Column vertical calculation:

						2	1
✖							2
						4	2
						4	2

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 2×80
    Solution:
    2×80 = 160
    Column vertical calculation:

							2
✖						8	0
							0
					1	6
					1	6	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×9
    Solution:
    20×9 = 180
    Column vertical calculation:

						2	0
✖							9
					1	8	0
					1	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 24×9
    Solution:
    24×9 = 216
    Column vertical calculation:

						2	4
✖							9
					2	1	6
					2	1	6

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×5
    Solution:
    21×5 = 105
    Column vertical calculation:

						2	1
✖							5
					1	0	5
					1	0	5

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 15×2
    Solution:
    15×2 = 30
    Column vertical calculation:

						1	5
✖							2
						3	0
						3	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×3
    Solution:
    21×3 = 63
    Column vertical calculation:

						2	1
✖							3
						6	3
						6	3

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>>注：本次最多计算 7 道题。

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