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: 65×40
    Solution:
    65×40 = 2600
    Column vertical calculation:

							6	5
✖							4	0
							0	0
					2	6	0
					2	6	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 76×2
    Solution:
    76×2 = 152
    Column vertical calculation:

						7	6
✖							2
					1	5	2
					1	5	2

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 66×2
    Solution:
    66×2 = 132
    Column vertical calculation:

						6	6
✖							2
					1	3	2
					1	3	2

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 68×2
    Solution:
    68×2 = 136
    Column vertical calculation:

						6	8
✖							2
					1	3	6
					1	3	6

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 65×4
    Solution:
    65×4 = 260
    Column vertical calculation:

						6	5
✖							4
					2	6	0
					2	6	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 76×20
    Solution:
    76×20 = 1520
    Column vertical calculation:

							7	6
✖							2	0
							0	0
					1	5	2
					1	5	2	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 66×80
    Solution:
    66×80 = 5280
    Column vertical calculation:

							6	6
✖							8	0
							0	0
					5	2	8
					5	2	8	0

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>>注：本次最多计算 7 道题。

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