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: 22×3
    Solution:
    22×3 = 66
    Column vertical calculation:

						2	2
✖							3
						6	6
						6	6

[2/7 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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 5×70
    Solution:
    5×70 = 350
    Column vertical calculation:

							5
✖						7	0
							0
					3	5
					3	5	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×8
    Solution:
    21×8 = 168
    Column vertical calculation:

						2	1
✖							8
					1	6	8
					1	6	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 90×5
    Solution:
    90×5 = 450
    Column vertical calculation:

						9	0
✖							5
					4	5	0
					4	5	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: 20×6
    Solution:
    20×6 = 120
    Column vertical calculation:

						2	0
✖							6
					1	2	0
					1	2	0

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>>注：本次最多计算 7 道题。

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