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: 43×2
    Solution:
    43×2 = 86
    Column vertical calculation:

						4	3
✖							2
						8	6
						8	6

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 34×30
    Solution:
    34×30 = 1020
    Column vertical calculation:

							3	4
✖							3	0
							0	0
					1	0	2
					1	0	2	0

[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: 26×20
    Solution:
    26×20 = 520
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 43×20
    Solution:
    43×20 = 860
    Column vertical calculation:

							4	3
✖							2	0
							0	0
						8	6
						8	6	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 34×300
    Solution:
    34×300 = 10200
    Column vertical calculation:

								3	4
✖							3	0	0
								0	0
							0	0
					1	0	2
					1	0	2	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×300
    Solution:
    21×300 = 6300
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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