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: 42×5
    Solution:
    42×5 = 210
    Column vertical calculation:

						4	2
✖							5
					2	1	0
					2	1	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 62×2
    Solution:
    62×2 = 124
    Column vertical calculation:

						6	2
✖							2
					1	2	4
					1	2	4

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 65×60
    Solution:
    65×60 = 3900
    Column vertical calculation:

							6	5
✖							6	0
							0	0
					3	9	0
					3	9	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 47×20
    Solution:
    47×20 = 940
    Column vertical calculation:

							4	7
✖							2	0
							0	0
						9	4
						9	4	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×50
    Solution:
    42×50 = 2100
    Column vertical calculation:

							4	2
✖							5	0
							0	0
					2	1	0
					2	1	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 52×20
    Solution:
    52×20 = 1040
    Column vertical calculation:

							5	2
✖							2	0
							0	0
					1	0	4
					1	0	4	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 56×20
    Solution:
    56×20 = 1120
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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