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: 56×63
    Solution:
    56×63 = 3528
    Column vertical calculation:

							5	6
✖							6	3
						1	6	8
					3	3	6
					3	5	2	8

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 49×42
    Solution:
    49×42 = 2058
    Column vertical calculation:

							4	9
✖							4	2
							9	8
					1	9	6
					2	0	5	8

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×30
    Solution:
    21×30 = 630
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×15
    Solution:
    42×15 = 630
    Column vertical calculation:

							4	2
✖							1	5
						2	1	0
						4	2
						6	3	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 45×63
    Solution:
    45×63 = 2835
    Column vertical calculation:

							4	5
✖							6	3
						1	3	5
					2	7	0
					2	8	3	5

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 54×45
    Solution:
    54×45 = 2430
    Column vertical calculation:

							5	4
✖							4	5
						2	7	0
					2	1	6
					2	4	3	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×24
    Solution:
    12×24 = 288
    Column vertical calculation:

							1	2
✖							2	4
							4	8
						2	4
						2	8	8

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>>注：本次最多计算 7 道题。

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