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: 22×22
    Solution:
    22×22 = 484
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 62×42
    Solution:
    62×42 = 2604
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 24×42
    Solution:
    24×42 = 1008
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 25×21
    Solution:
    25×21 = 525
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×42
    Solution:
    12×42 = 504
    Column vertical calculation:

							1	2
✖							4	2
							2	4
						4	8
						5	0	4

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 28×27
    Solution:
    28×27 = 756
    Column vertical calculation:

							2	8
✖							2	7
						1	9	6
						5	6
						7	5	6

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 23×27
    Solution:
    23×27 = 621
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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