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: 45×40
    Solution:
    45×40 = 1800
    Column vertical calculation:

							4	5
✖							4	0
							0	0
					1	8	0
					1	8	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 56×2
    Solution:
    56×2 = 112
    Column vertical calculation:

						5	6
✖							2
					1	1	2
					1	1	2

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 46×2
    Solution:
    46×2 = 92
    Column vertical calculation:

						4	6
✖							2
						9	2
						9	2

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 48×2
    Solution:
    48×2 = 96
    Column vertical calculation:

						4	8
✖							2
						9	6
						9	6

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 45×4
    Solution:
    45×4 = 180
    Column vertical calculation:

						4	5
✖							4
					1	8	0
					1	8	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 66×20
    Solution:
    66×20 = 1320
    Column vertical calculation:

							6	6
✖							2	0
							0	0
					1	3	2
					1	3	2	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 64×20
    Solution:
    64×20 = 1280
    Column vertical calculation:

							6	4
✖							2	0
							0	0
					1	2	8
					1	2	8	0

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>>注：本次最多计算 7 道题。

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