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: 17×61
    Solution:
    17×61 = 1037
    Column vertical calculation:

							1	7
✖							6	1
							1	7
					1	0	2
					1	0	3	7

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×18
    Solution:
    42×18 = 756
    Column vertical calculation:

							4	2
✖							1	8
						3	3	6
						4	2
						7	5	6

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×61
    Solution:
    18×61 = 1098
    Column vertical calculation:

							1	8
✖							6	1
							1	8
					1	0	8
					1	0	9	8

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×16
    Solution:
    42×16 = 672
    Column vertical calculation:

							4	2
✖							1	6
						2	5	2
						4	2
						6	7	2

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 23×12
    Solution:
    23×12 = 276
    Column vertical calculation:

							2	3
✖							1	2
							4	6
						2	3
						2	7	6

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 50×21
    Solution:
    50×21 = 1050
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 52×21
    Solution:
    52×21 = 1092
    Column vertical calculation:

							5	2
✖							2	1
							5	2
					1	0	4
					1	0	9	2

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>>注：本次最多计算 7 道题。

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