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: 48×28
    Solution:
    48×28 = 1344
    Column vertical calculation:

							4	8
✖							2	8
						3	8	4
						9	6
					1	3	4	4

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×32
    Solution:
    21×32 = 672
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 67×68
    Solution:
    67×68 = 4556
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 45×28
    Solution:
    45×28 = 1260
    Column vertical calculation:

							4	5
✖							2	8
						3	6	0
						9	0
					1	2	6	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 36×42
    Solution:
    36×42 = 1512
    Column vertical calculation:

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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 74×73
    Solution:
    74×73 = 5402
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 58×47
    Solution:
    58×47 = 2726
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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