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: 22×4
    Solution:
    22×4 = 88
    Column vertical calculation:

						2	2
✖							4
						8	8
						8	8

[2/7 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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 6×70
    Solution:
    6×70 = 420
    Column vertical calculation:

							6
✖						7	0
							0
					4	2
					4	2	0

[4/7 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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 90×4
    Solution:
    90×4 = 360
    Column vertical calculation:

						9	0
✖							4
					3	6	0
					3	6	0

[6/7 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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×5
    Solution:
    20×5 = 100
    Column vertical calculation:

						2	0
✖							5
					1	0	0
					1	0	0

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>>注：本次最多计算 7 道题。

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